{"id":480527,"date":"2026-10-19T11:12:09","date_gmt":"2026-10-19T18:12:09","guid":{"rendered":"https:\/\/climatescience.press\/?p=480527"},"modified":"2026-10-19T11:12:11","modified_gmt":"2026-10-19T18:12:11","slug":"santa-ana-winds-the-fierce-devil-winds-that-shape-southern-californias-weather-wildfires-and-history","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=480527","title":{"rendered":"Santa Ana Winds: The Fierce \u201cDevil Winds\u201d That Shape Southern California\u2019s Weather, Wildfires, and History"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"485\" data-attachment-id=\"480528\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=480528\" 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data-image-title=\"0 Santa Ana Winds  The Fierce \u201cDevil Winds\u201d That Shape Southern California\u2019s Weather, Wildfires, and History\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Signature: 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&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?fit=723%2C485&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?resize=723%2C485&#038;ssl=1\" alt=\"A dramatic landscape image featuring rolling hills and mountains under a cloudy sky, with smoke rising in the background, illustrating the impact of Santa Ana winds in Southern California.\" class=\"wp-image-480528\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?resize=1024%2C687&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?resize=300%2C201&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?resize=768%2C516&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?resize=640%2C430&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><figcaption class=\"wp-element-caption\">AI generated by Grok<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Santa Ana winds<\/em> (also called <em>Santa Anas<\/em> or <em>\u201cdevil winds\u201d<\/em>) are strong, hot, and extremely dry downslope winds that affect coastal Southern California and northern Baja California.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They blow from inland desert regions (primarily the Great Basin of Nevada, Utah, and surrounding areas) toward the Pacific Ocean, descending the leeward (downwind) slopes of coastal mountain ranges. They typically arrive from the northeast or east and funnel through mountain passes and canyons such as Cajon Pass, the Santa Clara River Valley, Banning Pass, and Santa Ana Canyon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High- pressure systems build over the cooler, higher- elevation Great Basin deserts (especially in fall and winter). Air flows clockwise out of these highs toward lower pressure near the coast. As the air descends thousands of feet, it is compressed and warms adiabatically, at roughly 10 \u00b0C (about 18 \u00b0F) per kilometer of descent, or roughly 5 \u00b0F per 1,000 feet. This warming also sharply lowers relative humidity (often to single digits or teens). The air accelerates dramatically when squeezed through narrow canyons and passes (a venturi and gap- wind effect), producing strong gusts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>They are a type of <em>katabatic (downslope)<\/em> wind, similar to foehn or Chinook winds elsewhere.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Season and characteristics<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Most common from early fall through early spring (roughly September- May), with a peak often in December- January, though they can occur outside this window.<a href=\"https:\/\/www.britannica.com\/science\/Santa-Ana-winds\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li><strong>Typical speeds:<\/strong> sustained winds around 20- 40 mph (30- 65 km\/h), with common gusts of 40- 70 mph (65\u2013110 km\/h). Extreme events can produce gusts exceeding 80- 100 and more mph in the windiest canyons and mountain locations.<a href=\"https:\/\/weather.com\/2026\/10\/15\/safety\/wildfires\/santa-ana-winds-california\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>They bring <strong>very low humidity<\/strong>, <strong>clear skies<\/strong>, and <strong>warm- to- hot temperatures<\/strong> (sometimes the hottest of the year for the season), even when originating from cooler desert air.<\/li>\n\n\n\n<li><strong>Events usually last 1- 7 days<\/strong> (average around 3), though longer ones occur. About 10- 25 events typically happen per year.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Impacts<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The combination of heat, extreme dryness, and high winds creates critical fire weather: vegetation dries rapidly, and any ignition (power lines, sparks, etc.) can spread extremely fast. They have driven many of Southern California\u2019s <strong>most destructive wildfires<\/strong>. They can also cause wind damage, power outages\/shutoffs, blowing dust, hazardous driving conditions, and aviation turbulence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The name most likely derives from Santa Ana Canyon (between the Santa Ana Mountains and Chino Hills in Orange County), with written references dating to the late 19th century. Alternative folk etymologies involving<strong> \u201cSantana\u201d or \u201cdevil\u201d winds<\/strong> exist but are less supported.<a href=\"https:\/\/www.britannica.com\/science\/Santa-Ana-winds\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As of mid- to- late October 2026, Southern California experienced its first notable Santa Ana event of the fall season around October 15- 17, bringing red- flag fire weather warnings, strong gusts, heat, and several wildfires. By October 19 the winds had largely subsided, with a cooling trend and potential rain later in the week.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In short, Santa Ana winds are a dramatic and sometimes dangerous part of Southern California\u2019s climate, driven by regional pressure patterns and topography.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Santa Ana winds have been observed and described in Southern California for centuries, though the specific name emerged in the late 19th century. They are a longstanding feature of the region\u2019s climate, driven by the same high- pressure patterns over the Great Basin and the topography of the coastal mountains and passes.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Early Observations (Pre-Name Era)<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Spanish and early American accounts described strong, dry northeast or east winds without using the modern name:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In 1812, a Spanish report from the San Diego Presidio noted northeast winds damaging wheat crops at San Juan Capistrano.<a href=\"https:\/\/ochistorical.blogspot.com\/2021\/04\/the-santa-ana-winds-still-blow.html\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>In 1836, Richard Henry Dana\u2019s <em>Two Years Before the Mast<\/em> recounted a <strong>\u201cviolent northeaster\u201d<\/strong> that forced his ship to seek shelter near Santa Catalina Island.<a href=\"https:\/\/www.pbssocal.org\/shows\/lost-la\/the-devil-wind-a-brief-history-of-the-santa-anas\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>In January 1847, during the Mexican- American War, U.S. forces under Commodore Robert Stockton (and reports by Major William Emory) experienced a fierce gale near the mouth of Santa Ana Canyon while camped en route to Los Angeles. Descriptions called it a <strong>\u201churricane\u201d<\/strong> that filled the air with fine dust, made breathing difficult, and would have complicated loading firearms.<a href=\"https:\/\/www.ochistoryland.com\/sawinds\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These accounts match classic Santa Ana characteristics: strong winds, dust, and dryness. Paleoclimate evidence from charcoal deposits in the Santa Barbara Basin indicates large fires under Santa Ana- like conditions occurring for at least 560 years (back to around A.D. 1425), with patterns linked to climate variability rather than major shifts from Indigenous, Spanish, or modern land-use practices.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Origin of the Name<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The name almost certainly derives from <strong>Santa Ana Canyon<\/strong> (in present- day Orange County, between the Santa Ana Mountains and Chino\/Puente Hills), where the winds often blow with particular force and appear to originate from the perspective of early settlers in the area. The canyon, river, and later the city of Santa Ana takes their name from the Portol\u00e1 expedition\u2019s entry into the valley on or near Saint Anne\u2019s feast day in 1769.<a href=\"https:\/\/en.wikipedia.org\/api\/rest_v1\/page\/html\/Santa_Ana_winds\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The earliest known printed references appear in the <em>Anaheim Gazette<\/em> in 1871 (e.g., mentions of \u201cwithering Santa Ana\u2019s\u201d or a detailed October account of a hot, dusty wind sweeping through the canyon).<a href=\"https:\/\/www.ochistoryland.com\/sawinds\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>Another early citation is in the <em>Los Angeles Evening Express<\/em> on November 15, 1880 (\u201cThe Philosophy of Sandstorms\u201d).<a href=\"https:\/\/www.pbssocal.org\/shows\/lost-la\/the-devil-wind-a-brief-history-of-the-santa-anas\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>By the 1880s the term was in regular local use, and the U.S. Weather Bureau formalized it in publications around 1903.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Controversies and alternative theories:<\/strong> <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Residents and the Chamber of Commerce of the city of Santa Ana disliked the association of their name with destructive winds and campaigned against it (proposing alternatives such as <strong>\u201cRiverside Zephyr\u201d<\/strong>). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In 1922, a local resident suggested <strong>\u201cSantana\u201d<\/strong>, claiming it was an Indigenous word for a big or <strong>devil wind <\/strong>(later corrupted via <strong>Spanish \u201cSatan\u00e1s\u201d<\/strong>). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Linguists and historians have found no supporting evidence for an Indigenous term <strong>\u201cSantana, sandana\u201d<\/strong>, and the Spanish word for Satan is <em>Satan\u00e1s<\/em> (or devil <em>diablo<\/em>). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Other weak folk theories link it to <strong>Mexican general Antonio L\u00f3pez de Santa Anna or Saint Anne\u2019s Day<\/strong> itself. Most historical research (including by Orange County historians and folklorists such as Terry Stephenson in 1943) supports the canyon origin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Historical Impacts and Notable Events<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">From the pioneer era onward, the winds damaged crops, orchards, wooden buildings, and infrastructure, raised blinding dust storms, and drove wildfires. Early settlers sometimes viewed milder events as beneficial (e.g., for drying raisins or clearing fog) or as harbingers of approaching rain.<a href=\"https:\/\/www.latimes.com\/california\/story\/2021-09-28\/santa-ana-wind-season-los-angeles-patt-morrison\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They have fueled many of Southern California\u2019s largest and most destructive wildfires. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Late-19th- century fires such as the Santiago Canyon Fire of 1889.<\/li>\n\n\n\n<li>20th- and 21st- century events including the Laguna Fire (1970), Cedar Fire and Old Fire (2003), Witch Creek Fire (2007), Thomas Fire (2017), and numerous others in which strong, dry Santa Ana conditions rapidly spread flames through dry vegetation, often starting from power lines, arson, or other ignitions.<a href=\"https:\/\/www.weatherbug.com\/news\/The-Santa-Ana-Winds\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Extreme wind events have also caused widespread power outages, structural damage, and hazardous conditions (e.g., very strong gusts recorded in mountain and canyon locations in events such as those in 1957, 2011, and others).<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Cultural and Literary Significance<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The winds feature prominently in Southern California literature and folklore, often linked to tension, irritability, or a sense of unease (sometimes exaggerated as \u201chomicidal\u201d moods). Classic depictions appear in Raymond Chandler\u2019s stories (notably \u201cRed Wind\u201d), works by Joan Didion, and others. Nicknames have included \u201cdevil winds\u201d, \u201cred wind\u201d, or \u201cnortheasters\u201d.<a href=\"https:\/\/www.atmos.albany.edu\/facstaff\/rfovell\/SantaAna\/winds.html\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In summary, while the atmospheric phenomenon itself is ancient, the specific name \u201cSanta Ana winds\u201d entered written English in the 1870s- 1880s, tied firmly to the geography of Santa Ana Canyon, and has remained the standard term despite local efforts to change it. The winds continue to shape the region\u2019s weather, fire history, and cultural identity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Santa Ana winds create some of the most extreme wildfire conditions in Southern California by combining very low humidity, high temperatures (especially in \u201chot\u201d events), and strong, gusty winds that dry vegetation further and rapidly spread flames and embers.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Why the Fire Risk Is So High<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Extreme dryness: <\/strong>The descending air warms by compression, and its relative humidity often drops below 10- 15% (sometimes under 5%). This desiccates grasses, shrubs (chaparral), and other fuels that are already dry after the long Mediterranean- climate summer with little or no rain. Overnight humidity recovery is also limited, so fuels stay critically dry.<a href=\"https:\/\/www.universityofcalifornia.edu\/news\/how-santa-ana-winds-fueled-deadly-fires-southern-california\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li><strong>Wind- driven spread:<\/strong> Gusts commonly reach 40- 70 mph and can exceed 80- 100 and mph in canyons and passes (e.g., Fremont Canyon, Cajon Pass). Winds push the fire front aggressively and, more critically, loft burning embers long distances (sometimes over a mile), starting new spot fires ahead of the main blaze. Fires under these conditions often spread through the air rather than solely through continuous vegetation.<a href=\"https:\/\/www.nytimes.com\/interactive\/2025\/01\/29\/climate\/santa-ana-winds-fire-risk.html\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li><strong>Timing:<\/strong> Events peak in fall (especially October) into winter, precisely when fuels are driest. A single spark, from a downed power line, vehicle, equipment, arson, or other human source, can explode into a major fire within minutes. Firefighting becomes extremely difficult; aerial resources are often grounded, and crews focus on evacuation and protecting structures at the edges until winds ease.<a href=\"https:\/\/weather.com\/2026\/10\/15\/safety\/wildfires\/santa-ana-winds-california\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cHot\u201d Santa Ana events (warmer and often longer- lasting) are especially linked to large fires; historically, about 90% of large (>100- acre) Santa Ana- spread wildfires and 95% of the associated burned area occurred during hot events.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Key Statistics and Patterns<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Santa Ana wind (SAW)<\/strong> days account for a disproportionate share of destructive fall and winter fires. One analysis found they explain roughly 90% of the area burned by fall and winter wildfires in Southern California since 1950. Another long- term study (1948- 2018) showed SAW- ignited fires responsible for about 45% of total area burned in the region despite comprising fewer overall fire days.<a href=\"https:\/\/www.nytimes.com\/interactive\/2025\/01\/29\/climate\/santa-ana-winds-fire-risk.html\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>Burned area per day is typically 3.5- 4.5 times larger on SAW days than non- SAW days.<a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC8411922\/\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li>Critically, <strong>ignitions matter more than the winds alone:<\/strong> Over 75% of SAW events produce no fires at all. Nearly 100% of SAW fires are human- caused. In recent decades, power- line failures have become a leading ignition source. Models show the number of ignitions is the strongest predictor of area burned, followed by wind intensity; short-term temperature or antecedent precipitation play smaller roles.<a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.abh2262\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Major historical examples include the Laguna Fire (1970), Cedar and Old Fires (2003), Witch Creek Fire (2007), Thomas Fire (2017), Woolsey Fire (2018), and many others that destroyed thousands of structures and caused significant loss of life under strong Santa Ana conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Climate Change Influence<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Research indicates climate change is already reducing the frequency of weak- to- moderate Santa Ana events because deserts in the <strong>Great Basin<\/strong> are warming faster than the coastal ocean, shrinking the temperature and pressure contrast that drives the winds. By 2100 this could eliminate roughly 1 in 10- 20 events (mostly the milder ones). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, the strongest, most dangerous fire-weather events show little sign of decreasing, and overall wildfire risk remains high or is increasing due to hotter baseline temperatures, drier fuels, extended fire seasons (now into winter), and greater fuel loads after wet years followed by drought.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Recent Context (October 2026)<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The first notable Santa Ana event of the 2026 season (roughly October 15- 17) produced red-flag warnings across much of Los Angeles, Ventura, and surrounding counties, with gusts of 40- 70 and mph (isolated higher), very low humidity, and warm temperatures. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Several wildfires ignited or grew rapidly (including in Malibu, Orange County, and other areas), prompting evacuations, road closures, and public-safety power shutoffs affecting tens or hundreds of thousands of customers. By October 18- 19 the strongest winds had abated, allowing progress on containment, though rain later in the week raised secondary concerns about debris flows on burn scars.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Risk Reduction<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Because ignitions are the limiting factor during wind events, utilities use <strong>public safety power shutoffs (PSPS)<\/strong>, enhanced line inspections, and vegetation clearance around infrastructure. Homeowners and communities reduce risk through defensible space, home-hardening (ember-resistant vents, roofs, etc.), and preparedness plans. Forecasters issue Red Flag Warnings and the <strong>Santa Ana Wildfire Threat Index (SAWTI)<\/strong> to highlight the highest-danger periods.<a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.abh2262\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In essence, Santa Ana winds turn ordinary sparks into fast- moving, hard- to-control disasters by creating a perfect storm of dry fuels and extreme wind. Reducing human ignitions remains one of the most effective ways to limit losses even as the climate evolves.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Santa Ana winds are forecast primarily by identifying the large- scale weather patterns that produce them and then refining the details with high- resolution models, pressure gradients, and specialized fire- weather tools. <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The National Weather Service (NWS) offices in Los Angeles and Oxnard (LOX) and San Diego (SGX), along with Predictive Services and the U.S. Forest Service, lead this process.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Key Meteorological Indicators<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Forecasters look for these classic ingredients:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Surface pressure pattern:<\/strong> High pressure (anticyclone) building over the Great Basin (Nevada and Utah deserts) and lower pressure near or off the Southern California coast. This creates an offshore pressure gradient that drives air from the northeast\/east toward the ocean. A commonly monitored metric is the pressure difference between stations such as Los Angeles International Airport (LAX) and Daggett (DAG) or similar pairs; differences of about 5 mb or more (often 7- 9 and more mb in stronger events) signal significant Santa Ana potential.<a href=\"https:\/\/journals.ametsoc.org\/view\/journals\/wefo\/40\/4\/WAF-D-24-0013.1.xml\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li><strong>Upper- level support:<\/strong> Northeasterly or easterly winds aloft (especially around 850 mb), often enhanced by a ridge of high pressure or an upper- level low positioned to the south\/southwest (e.g., near Arizona). Cold- air advection in the lower troposphere over the deserts also strengthens the setup.<a href=\"https:\/\/www.researchgate.net\/publication\/280132557_Diagnosing_Santa_Ana_Winds_in_Southern_California_with_Synoptic-Scale_Analysis\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li><strong>Terrain channeling:<\/strong> Once the large- scale flow is in place, air accelerates through mountain passes and canyons (Cajon, Santa Ana, Santa Clara River Valley, Banning\/San Gorgonio, etc.) due to the venturi effect and downslope warming and drying.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Winds often peak overnight into the early morning as nighttime cooling over the deserts strengthens the pressure gradient.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Specialized Fire- Weather Products<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Because the main hazard is wildfire, forecasts integrate fuel conditions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Santa Ana Wildfire Threat Index (SAWTI):<\/strong> Produced by the USDA Forest Service and Predictive Services. It combines forecast wind speed and atmospheric moisture with dead fuel moisture, live fuel moisture, and the \u201cgreenness\u201d of annual grasses. The result is a 6- day outlook of large- fire potential rated as No Rating, Marginal, Moderate, High, or Extreme.<\/li>\n\n\n\n<li><strong>Red Flag Warnings and Fire Weather Watches:<\/strong> Issued by the NWS when strong winds, low relative humidity (often single digits to teens), and dry fuels coincide. These highlight critical fire-weather periods.<\/li>\n\n\n\n<li><strong>Wind Advisories and High Wind Warnings:<\/strong> Focused on the wind hazard itself (gusts typically 40- 70 and more mph in favored areas, higher in mountains).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">NWS Area Forecast Discussions (AFDs) provide detailed narrative explanations of the expected strength, timing, coverage, temperature\/humidity impacts, and confidence levels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Practical Forecasting Process<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Monitor synoptic models for the developing high over the Great Basin and offshore gradients.<\/li>\n\n\n\n<li>Assess upper- level winds and temperature advection.<\/li>\n\n\n\n<li>Run or consult high- resolution and downscaled guidance for local wind speeds and direction.<\/li>\n\n\n\n<li>Layer in fuel moisture data for fire potential (via SAWTI and similar tools).<\/li>\n\n\n\n<li>Issue watches and warnings and update as observations confirm or models adjust the forecast.<\/li>\n\n\n\n<li>Communicate via weather.gov, social media, and coordination with fire agencies and utilities (who may initiate public safety power shutoffs).<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Forecast skill is generally good for the occurrence and broad timing of events several days out, though exact peak gust locations and strengths can still vary due to small shifts in the pressure gradient or upper flow. Continuous model improvements and specialized indices like SAWTI have enhanced both wind and fire-risk predictions in recent years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Santa Ana winds (also called Santa Anas or \u201cdevil winds\u201d) are strong, hot, and extremely dry downslope winds that affect coastal Southern California and northern Baja California.<\/p>\n<p>They are a type of katabatic (downslope) wind, similar to foehn or Chinook winds elsewhere.<\/p>\n<p>Santa Ana winds have been observed and described in Southern California for centuries, though the specific name emerged in the late 19th century. They are a longstanding feature of the region\u2019s climate, driven by the same high- pressure patterns over the Great Basin and the topography of the coastal mountains and passes.<\/p>\n","protected":false},"author":121246920,"featured_media":480528,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"Discover the impact of Santa Ana winds on Southern California's climate, fire risks, and history, and learn how they shape the region's weather.","jetpack_seo_html_title":"Understanding Santa Ana Winds: California's Fire Hazard Risks","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691846550,691846540,691846548,691846544,691846543,691846541,691833930,691846546,691846547,691846545,691846542,691846551,691846549],"class_list":["post-480527","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-hot-santa-ana-events","tag-santana-or-devil-winds","tag-extreme-dryness","tag-great-basin","tag-katabatic-downslope-wind","tag-most-destructive-wildfires","tag-national-weather-service-nws","tag-public-safety-power-shutoffs-psps","tag-santa-ana-canyon","tag-santa-ana-wildfire-threat-index-sawti","tag-santa-anas-or-devil-winds","tag-wind-advisories-and-high-wind-warnings","tag-wind-driven-spread","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-210r","jetpack-related-posts":[{"id":362910,"url":"https:\/\/climatescience.press\/?p=362910","url_meta":{"origin":480527,"position":0},"title":"The Origin of The Los Angeles Wildfires","author":"uwe.roland.gross","date":"01\/21\/2025","format":false,"excerpt":"My group and scientists from the University of Albany are now studying the meteorology of the LA wildfires earlier this month and have significant early results. At the American Meteorological Society meeting last week, I attended many wildfire meteorology sessions and talked to several colleagues who have actively studied such\u2026","rel":"","context":"In \"Climate change\"","block_context":{"text":"Climate change","link":"https:\/\/climatescience.press\/?tag=climate-change"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Screenshot-2025-01-18-at-4.15.09-PM.png?fit=1200%2C698&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Screenshot-2025-01-18-at-4.15.09-PM.png?fit=1200%2C698&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Screenshot-2025-01-18-at-4.15.09-PM.png?fit=1200%2C698&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Screenshot-2025-01-18-at-4.15.09-PM.png?fit=1200%2C698&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Screenshot-2025-01-18-at-4.15.09-PM.png?fit=1200%2C698&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":362153,"url":"https:\/\/climatescience.press\/?p=362153","url_meta":{"origin":480527,"position":1},"title":"Countering man-made climate change claims on wildfires","author":"uwe.roland.gross","date":"01\/15\/2025","format":false,"excerpt":"I really did not want to wade into the absurdity of the wildfire climate debate, but this pushed me over the edge.","rel":"","context":"In \"California\u00a0government\"","block_context":{"text":"California\u00a0government","link":"https:\/\/climatescience.press\/?tag=california-government"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Burning-house.jpg?fit=1200%2C952&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Burning-house.jpg?fit=1200%2C952&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Burning-house.jpg?fit=1200%2C952&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Burning-house.jpg?fit=1200%2C952&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Burning-house.jpg?fit=1200%2C952&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":366076,"url":"https:\/\/climatescience.press\/?p=366076","url_meta":{"origin":480527,"position":2},"title":"The LA fires were man-made, but not like they say","author":"uwe.roland.gross","date":"02\/14\/2025","format":false,"excerpt":"The political fires that ignited with President\u00a0Donald Trump\u2019s\u00a0second inauguration shifted national attention away from the devastating wildfires in\u00a0California. Now entirely contained, the\u00a0Los Angeles\u00a0County fires should not be allowed to fade into the history books, chalked up to yet another consequence of man-made global warming. Politicians trying to pin the blame\u2026","rel":"","context":"In \"California\"","block_context":{"text":"California","link":"https:\/\/climatescience.press\/?tag=california"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/02\/0Fire-closeup.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/02\/0Fire-closeup.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/02\/0Fire-closeup.jpg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/02\/0Fire-closeup.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/02\/0Fire-closeup.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":361268,"url":"https:\/\/climatescience.press\/?p=361268","url_meta":{"origin":480527,"position":3},"title":"The California fires are not climate","author":"uwe.roland.gross","date":"01\/10\/2025","format":false,"excerpt":"Here we go. . . First, climate change does cause forest fires. That isn\u2019t how this works. Fires require an ignition source and fuel.","rel":"","context":"In \"Baja California\"","block_context":{"text":"Baja California","link":"https:\/\/climatescience.press\/?tag=baja-california"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Fire-LA.jpg?fit=1072%2C628&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Fire-LA.jpg?fit=1072%2C628&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Fire-LA.jpg?fit=1072%2C628&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Fire-LA.jpg?fit=1072%2C628&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0Fire-LA.jpg?fit=1072%2C628&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":362345,"url":"https:\/\/climatescience.press\/?p=362345","url_meta":{"origin":480527,"position":4},"title":"Why the LA Wildfires Have Little to Do with Drought or Climate Change","author":"uwe.roland.gross","date":"01\/16\/2025","format":false,"excerpt":"Some climate activists and media outlets are claiming the drought or climate change were major contributors to the recent wildfires around Los Angeles. These claims can easily be shown to be false.","rel":"","context":"In \"Climate change\"","block_context":{"text":"Climate change","link":"https:\/\/climatescience.press\/?tag=climate-change"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0a-u-s-flag-flies-as-fire-engulfs-a-structure-while-the-palisades-fire-burns-during-a-windstorm-on-the-west-side-of-los-angeles.webp?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0a-u-s-flag-flies-as-fire-engulfs-a-structure-while-the-palisades-fire-burns-during-a-windstorm-on-the-west-side-of-los-angeles.webp?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0a-u-s-flag-flies-as-fire-engulfs-a-structure-while-the-palisades-fire-burns-during-a-windstorm-on-the-west-side-of-los-angeles.webp?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0a-u-s-flag-flies-as-fire-engulfs-a-structure-while-the-palisades-fire-burns-during-a-windstorm-on-the-west-side-of-los-angeles.webp?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0a-u-s-flag-flies-as-fire-engulfs-a-structure-while-the-palisades-fire-burns-during-a-windstorm-on-the-west-side-of-los-angeles.webp?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":362183,"url":"https:\/\/climatescience.press\/?p=362183","url_meta":{"origin":480527,"position":5},"title":"Assigning Responsibility for the Tragic Los Angeles Fires","author":"uwe.roland.gross","date":"01\/15\/2025","format":false,"excerpt":"First understand Southern California is naturally dry. Its Mediterranean climate means it rarely rains in the summer and has a limited winter rainy season. Three deserts in the region attest to its dry climate.","rel":"","context":"In \"Global warming\"","block_context":{"text":"Global warming","link":"https:\/\/climatescience.press\/?tag=global-warming"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0los-angeles-wildfire-1-1736603486615.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0los-angeles-wildfire-1-1736603486615.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0los-angeles-wildfire-1-1736603486615.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0los-angeles-wildfire-1-1736603486615.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/01\/0los-angeles-wildfire-1-1736603486615.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-Santa-Ana-Winds-The-Fierce-Devil-Winds-That-Shape-Southern-Californias-Weather-Wildfires-and-History.jpg?fit=1168%2C784&ssl=1","_links":{"self":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/480527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/users\/121246920"}],"replies":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=480527"}],"version-history":[{"count":35,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/480527\/revisions"}],"predecessor-version":[{"id":480564,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/480527\/revisions\/480564"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/media\/480528"}],"wp:attachment":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=480527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=480527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=480527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}