{"id":417032,"date":"2025-12-11T19:35:12","date_gmt":"2025-12-11T18:35:12","guid":{"rendered":"https:\/\/climatescience.press\/?p=417032"},"modified":"2025-12-11T19:35:15","modified_gmt":"2025-12-11T18:35:15","slug":"northern-hemisphere-tropical-activity-in-2025","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=417032","title":{"rendered":"Northern Hemisphere tropical activity in 2025"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"405\" data-attachment-id=\"417046\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417046\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?fit=1356%2C759&amp;ssl=1\" data-orig-size=\"1356,759\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"0Screenshot 2025-12-11 193344\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?fit=723%2C405&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?resize=723%2C405&#038;ssl=1\" alt=\"A graph displaying global major hurricane frequency from 1980 to 2025, showing 12-month running sums for all hurricanes and major hurricanes with data points marked and two colored lines indicating trends.\" class=\"wp-image-417046\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?resize=1024%2C573&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?resize=300%2C168&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?resize=768%2C430&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?resize=640%2C358&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?resize=1200%2C672&amp;ssl=1 1200w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?w=1356&amp;ssl=1 1356w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From <a href=\"https:\/\/wattsupwiththat.com\/2025\/12\/09\/northern-hemisphere-tropical-activity-in-2025\/\">Watts Up With That?<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By Paul Dorian<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"236\" data-attachment-id=\"417034\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417034\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-226.png?fit=720%2C236&amp;ssl=1\" data-orig-size=\"720,236\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-226.png?fit=720%2C236&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-226.png?resize=720%2C236&#038;ssl=1\" alt=\"Table showing climatological hurricane activity from 1991 to 2020, including named storms, storm days, hurricanes, and accumulated cyclone energy for different basins in the Northern Hemisphere.\" class=\"wp-image-417034\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-226.png?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-226.png?resize=300%2C98&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-226.png?resize=640%2C210&amp;ssl=1 640w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\"><em>Accumulated Cyclone Energy values (right column) are listed for the Northern Hemisphere as a whole and are also broken down into sectors including the North Atlantic, Northeast Pacific, Northwest Pacific, and North Indian. Real-time ACE statistics are calculated from the best operational tracks of NHC, CPHC and JTWC. Table courtesy\u00a0<\/em><a href=\"https:\/\/tropical.atmos.colostate.edu\/Realtime\/\"><em>Colorado State University<\/em><\/a><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>*Second year in a row with below-normal tropical activity across the Northern Hemisphere\u2026 western Pacific Ocean leads the way with its seventh straight down year\u2026no hurricanes hit the US for the first time in a decade*<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Overview<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 2025 hurricane season is winding down across the Northern Hemisphere, and it has been the second straight season with below-normal activity as measured by the metric known as the \u201cAccumulated Cyclone Energy (ACE)\u201d. The most important region when it comes to tropical activity in the Northern Hemisphere is the western half of the Pacific Ocean as it features the highest ACE value of any sector from a climatological point-of view and it was well below-normal for the 2025 tropical season. In the Atlantic Basin, tropical activity ended up slightly above the normal in terms of ACE thanks in large part to the end-of-season blockbuster hurricane named \u201cMelissa\u201d which reached category 5 status and lasted for a lengthy period. However, there were no landfalling hurricanes in the US for the first time since 2015, and the number of hurricanes, 5, was below the long-term average of 7.2. &nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Accumulated Cyclone Energy (ACE)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Accumulated Cyclone Energy or ACE metric was originally created by Dr. William Gray and associates at Colorado State University, and it was later tweaked by NOAA. This is perhaps the best metric to measure overall tropical activity (as opposed to, for example, the number of storms) \u2013 as it not only factors in the intensity of a tropical cyclone, but it considers its longevity. &nbsp;A \u201cmajor\u201d (category 3 or higher) hurricane, for example, that lasts for a long time will have a much bigger impact on the Accumulated Cyclone Energy than a short-lived and weaker tropical system.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"403\" data-attachment-id=\"417036\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417036\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-227.png?fit=720%2C403&amp;ssl=1\" data-orig-size=\"720,403\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-227.png?fit=720%2C403&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-227.png?resize=720%2C403&#038;ssl=1\" alt=\"Graph depicting Global Tropical Cyclone Accumulated Cyclone Energy (ACE) from 1970 to 2025, showing trends over time for the Northern Hemisphere and global values.\" class=\"wp-image-417036\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-227.png?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-227.png?resize=300%2C168&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-227.png?resize=640%2C358&amp;ssl=1 640w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\"><em>Last 50-years+ of Global and Northern Hemisphere Accumulated Cyclone Energy: 24 month running sums (through July 2025). Note that the year indicated represents the value of ACE through the previous 24-months for the Northern Hemisphere (bottom line\/gray boxes) and the entire global (top line\/blue boxes). The area in between represents the Southern Hemisphere total ACE. Plot courtesy NOAA, Dr. Ryan Maue<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Pacific Ocean<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Pacific Ocean is so large it is generally split into two sectors by meteorologists in the tracking of tropical activity using the international date line as the divider. The western part of the Pacific Ocean is the most important when it comes to global tropical activity as suggested by the climatological ACE which outweighs all other sectors of the northern hemisphere. The ACE levels for 2025 were slightly below-normal east of the date line and well below-normal in the all-important western Pacific. &nbsp;In fact, this crucial part of the Pacific Ocean has experienced below-normal activity during each of the past 7 years with seasonal ACE levels in each of those years below the average for the 1991-2020 baseline period. Interestingly, the number of storms in the western Pacific Ocean this season was above normal, suggesting the ACE level per storm was below the averages (i.e., more storms than normal, but they were weaker and of shorter duration compared to normal).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"535\" data-attachment-id=\"417038\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417038\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?fit=720%2C535&amp;ssl=1\" data-orig-size=\"720,535\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?fit=720%2C535&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?resize=720%2C535&#038;ssl=1\" alt=\"Map showing the paths of hurricanes during the 2025 North Atlantic hurricane season, indicating categories like major hurricanes and tropical storms.\" class=\"wp-image-417038\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?resize=300%2C223&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?resize=640%2C476&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-228.png?resize=200%2C150&amp;ssl=1 200w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\"><em>There were no landfalling hurricanes this year in the US for the first time since 2015. Map credit NOAA<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Atlantic Basin<\/strong><em><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While the Pacific Ocean featured below-normal tropical activity this season when measured by ACE levels, the Atlantic Basin ended up slightly above the normal. A large part of this finish at slightly above normal ACE levels in the Atlantic Basin was due to the very last storm, Hurricane Melissa, which reached category 5 status and was rather long-lived. The tropical wave that became Melissa originated over West Africa and traveled across the central Atlantic to the Caribbean Sea where is strengthened into a named tropical storm on October 21<sup>st<\/sup>. In just a few days after that, Melissa rapidly intensified into a Category 5 hurricane before making landfall in Jamaica while at its peak intensity\u2026the strongest Atlantic landfalling hurricane since Dorian in 2019 (both winds maximum sustained winds of 185 mph). Hurricane Melissa then crossed over eastern Cuba and the central Bahama Islands and approached Bermuda as a Category 2 hurricane by the end of the month.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"662\" data-attachment-id=\"417041\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417041\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-229.png?fit=720%2C662&amp;ssl=1\" data-orig-size=\"720,662\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-229.png?fit=720%2C662&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-229.png?resize=720%2C662&#038;ssl=1\" alt=\"Graph illustrating U.S. landfalling hurricane frequency from 1851 to 2025, featuring two sections: the top shows total landfalls, while the bottom displays major hurricanes. The data highlights variations in frequency over the years.\" class=\"wp-image-417041\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-229.png?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-229.png?resize=300%2C276&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-229.png?resize=640%2C588&amp;ssl=1 640w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\"><em>Trends are shown here from the middle 1800\u2019s to the present time for the US landfalling hurricanes (top) and US landfalling \u201cmajor\u201d hurricanes (bottom). Source NOAA, Meteorologist Chris Martz<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">In contrast to the western Pacific where ACE levels have been below-normal for the past 7 years, the Atlantic Basin has experienced above-normal conditions in 9 of the last 10 seasons (only below-normal year was 2022). Also, in contrast to the western Pacific where the number of storms was higher than normal but ACE per storm lower than normal, the number of storms (13) in the Atlantic Basin this year was below-normal suggesting that the average ACE per storm was above-normal. Interestingly, there were no landfalling hurricanes in the US this year which is the first time that has happened in ten years.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"388\" data-attachment-id=\"417042\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417042\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-230.png?fit=720%2C388&amp;ssl=1\" data-orig-size=\"720,388\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-230.png?fit=720%2C388&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-230.png?resize=720%2C388&#038;ssl=1\" alt=\"Graph showing the Atlantic Multidecadal Oscillation (AMO) index values from 1850 to 2020, illustrating annual values and a running 11-year average.\" class=\"wp-image-417042\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-230.png?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-230.png?resize=300%2C162&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-230.png?resize=640%2C345&amp;ssl=1 640w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\"><em>Annual Atlantic Multidecadal Oscillation (AMO) detrended index values since 1856. The thin line indicates 3-month average values, and the thick line is the simple running 11-year average. Further explanation in text\u00a0<\/em><a href=\"https:\/\/climate4you.com\/SeaTemperatures.htm#AMO%20(Atlantic%20Multidecadal%20Oscillation)%20Ind\"><em>above<\/em><\/a><em>. Data source:\u00a0<\/em><a href=\"http:\/\/www.esrl.noaa.gov\/psd\/data\/timeseries\/AMO\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Earth System Research Laboratory<\/em><\/a><em>\u00a0at NOAA.\u00a0Last year shown: 2022. Last diagram update: 24 January 2023.<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">One of the factors leading to consistent levels of above-normal activity in the Atlantic Basin during recent years is the persistent warmer-than-normal sea surface temperature pattern across the main development region. One index that gives us a clue as to the water temperatures in the Atlantic Ocean is known as the Atlantic Multidecadal Oscillation (AMO). The AMO represents\u00a0a long-term cycle of sea-surface temperature variations in the North Atlantic that influences weather patterns across North America and globally. It\u2019s linked to changes in the frequency and intensity of Atlantic hurricanes, drought conditions in North America and Africa, and large-scale atmospheric circulation patterns. \u00a0During a warm phase, the AMO is associated with an increase in the intensity and frequency of Atlantic hurricane seasons. Since ~1995, the AMO has been in a warm phase and if past patterns hold, the warm phase will potentially continue for another 5 or 10 years.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"650\" height=\"325\" data-attachment-id=\"417044\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=417044\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-231.png?fit=650%2C325&amp;ssl=1\" data-orig-size=\"650,325\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-231.png?fit=650%2C325&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-231.png?resize=650%2C325&#038;ssl=1\" alt=\"Graph showing the sea surface temperature anomaly of the Atlantic Ocean Main Development Region (MDR) from August to November 2025, with a blue line indicating temperature changes over time.\" class=\"wp-image-417044\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-231.png?w=650&amp;ssl=1 650w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-231.png?resize=300%2C150&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/image-231.png?resize=640%2C320&amp;ssl=1 640w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption class=\"wp-element-caption\"><em>Water temperatures were above-normal in the Atlantic Ocean\u2019s Main Development Region (MDR) during the heart of the tropical season (shown August-November). Water temperatures in the North Atlantic have been persistently above normal since the Atlantic Multidecadal Oscillation (AMO) flipped in the middle 1990\u2019s to a warm phase from a cold phase. Plot courtesy NOAA, tropicaltidbits.com<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">One final note on the comparison of tropical activity in today\u2019s era to periods in the past, there are likely to be significant underestimations in intensities of tropical systems prior to the satellite era (mid-1960\u2019s) according to some hurricane experts (e.g., Dr. Philip Klotzbach (CSU), Christopher Landsea (NOAA).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Meteorologist Paul Dorian<br>Arcfield<br><a href=\"https:\/\/www.arcfieldweather.com\/\">arcfieldweather.com<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Follow us on&nbsp;<a href=\"https:\/\/www.facebook.com\/ArcfieldWeather\">Facebook<\/a>,&nbsp;<a href=\"https:\/\/twitter.com\/ArcfieldWeather\">Twitter<\/a>,&nbsp;<a href=\"https:\/\/www.youtube.com\/c\/arcfieldweather\">YouTube<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Second year in a row with below-normal tropical activity across the Northern Hemisphere\u2026 western Pacific Ocean leads the way with its seventh straight down year\u2026no hurricanes hit the US for the first time in a decade<\/p>\n","protected":false},"author":121246920,"featured_media":417046,"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":"Explore the 2025 hurricane season's below-normal activity and the impact of Hurricane Melissa in the Atlantic. Insights on ACE trends included.","jetpack_seo_html_title":"2025 Northern Hemisphere Hurricane Season: Below-Normal Activity","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_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":true,"token":"eyJpbWciOiJodHRwczpcL1wvY2xpbWF0ZS1zY2llbmNlLnByZXNzXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI1XC8xMlwvMFNjcmVlbnNob3QtMjAyNS0xMi0xMS0xOTMzNDQtMTAyNHg1NzMucG5nIiwidHh0IjoiTm9ydGhlcm4gSGVtaXNwaGVyZSB0cm9waWNhbCBhY3Rpdml0eSBpbiAyMDI1IiwidGVtcGxhdGUiOiJoaWdod2F5IiwiZm9udCI6IiIsImJsb2dfaWQiOjE1NTgxMjQ0OX0.3ptzr1_uWqoqPhftNEEEkarNab-QbD6tQ2OWwXWzszsMQ"},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691826481,691828920,691818104,691818872,691818869,691818473],"class_list":["post-417032","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-accumulated-cyclone-energy-ace","tag-atlantic-multidecadal-oscillation-amo","tag-hurricanes","tag-northern-hemisphere","tag-ocean","tag-weather","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/0Screenshot-2025-12-11-193344.png?fit=1356%2C759&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1Kuk","jetpack-related-posts":[{"id":441135,"url":"https:\/\/climatescience.press\/?p=441135","url_meta":{"origin":417032,"position":0},"title":"Why Climate Models Get Ocean Warming Patterns Wrong: They Exaggerate Greenhouse Gas Effects on the Hemispheres","author":"uwe.roland.gross","date":"04\/24\/2026","format":false,"excerpt":"Climate models and ocean observations diverge primarily on the pattern of hemispheric ocean warming\u2014specifically, the interhemispheric thermal contrast (IHTC), or the difference in average sea surface temperature (SST) between the Northern and Southern Hemispheres. This is not a failure of global temperature trends (models and observations align closely on overall\u2026","rel":"","context":"In \"anthropogenic aerosols\"","block_context":{"text":"anthropogenic aerosols","link":"https:\/\/climatescience.press\/?tag=anthropogenic-aerosols"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Why-Climate-Models-Get-Ocean-Warming-Patterns-Wrong-They-Exaggerate-Greenhouse-Gas-Effects-on-the-Hemispheres.jpg?fit=1168%2C784&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Why-Climate-Models-Get-Ocean-Warming-Patterns-Wrong-They-Exaggerate-Greenhouse-Gas-Effects-on-the-Hemispheres.jpg?fit=1168%2C784&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Why-Climate-Models-Get-Ocean-Warming-Patterns-Wrong-They-Exaggerate-Greenhouse-Gas-Effects-on-the-Hemispheres.jpg?fit=1168%2C784&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Why-Climate-Models-Get-Ocean-Warming-Patterns-Wrong-They-Exaggerate-Greenhouse-Gas-Effects-on-the-Hemispheres.jpg?fit=1168%2C784&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Why-Climate-Models-Get-Ocean-Warming-Patterns-Wrong-They-Exaggerate-Greenhouse-Gas-Effects-on-the-Hemispheres.jpg?fit=1168%2C784&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":418224,"url":"https:\/\/climatescience.press\/?p=418224","url_meta":{"origin":417032,"position":1},"title":"The Critical Flaw in Single-Event Hurricane Climate Attribution","author":"uwe.roland.gross","date":"12\/22\/2025","format":false,"excerpt":"Less than a month has passed since the official end of the 2025 hurricane season for the Northern Hemisphere. 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Interestingly, 2025 statistics show that Accumulated Cyclone Energy (ACE) in the northern hemisphere was roughly 20% below the 1991-2020 mean while the number of major hurricanes and major hurricane days were\u2026","rel":"","context":"In \"Accumulated Cyclone Energy (ACE)\"","block_context":{"text":"Accumulated Cyclone Energy (ACE)","link":"https:\/\/climatescience.press\/?tag=accumulated-cyclone-energy-ace"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/AQMcbpQLc3Hg4E8SPBKConzuCKzERg4wEKBTgm2cdUusHsRn0wMDNPetmyNpUu86uAOuJEoE8rHIZGqpeHTLSzVj8BZgXlZm_eSzeds-JSN2YKHaRXhq3FdfK_Z2vG2e.png?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/AQMcbpQLc3Hg4E8SPBKConzuCKzERg4wEKBTgm2cdUusHsRn0wMDNPetmyNpUu86uAOuJEoE8rHIZGqpeHTLSzVj8BZgXlZm_eSzeds-JSN2YKHaRXhq3FdfK_Z2vG2e.png?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/AQMcbpQLc3Hg4E8SPBKConzuCKzERg4wEKBTgm2cdUusHsRn0wMDNPetmyNpUu86uAOuJEoE8rHIZGqpeHTLSzVj8BZgXlZm_eSzeds-JSN2YKHaRXhq3FdfK_Z2vG2e.png?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/AQMcbpQLc3Hg4E8SPBKConzuCKzERg4wEKBTgm2cdUusHsRn0wMDNPetmyNpUu86uAOuJEoE8rHIZGqpeHTLSzVj8BZgXlZm_eSzeds-JSN2YKHaRXhq3FdfK_Z2vG2e.png?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/12\/AQMcbpQLc3Hg4E8SPBKConzuCKzERg4wEKBTgm2cdUusHsRn0wMDNPetmyNpUu86uAOuJEoE8rHIZGqpeHTLSzVj8BZgXlZm_eSzeds-JSN2YKHaRXhq3FdfK_Z2vG2e.png?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":237935,"url":"https:\/\/climatescience.press\/?p=237935","url_meta":{"origin":417032,"position":3},"title":"2022 Global Wide Hurricane Season Ends with Weakest Storm Levels of the Last 42 Years","author":"uwe.roland.gross","date":"01\/05\/2023","format":false,"excerpt":"The year 2022 global wide ACE\u00a0data\u00a0outcome is about 29% lower than the\u00a0average over the 30 year-long (1991 through 2020)\u00a0climatology period tracked by Colorado\u00a0State University\u2019s Tropical\u00a0Meteorology Project data base.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/image-177.png?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/image-177.png?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/image-177.png?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/image-177.png?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/image-177.png?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":238136,"url":"https:\/\/climatescience.press\/?p=238136","url_meta":{"origin":417032,"position":4},"title":"Despite Media Hype, 2022 Global Wide Hurricane Season Ends with Weakest Storm Levels of the Last 42 Years","author":"uwe.roland.gross","date":"01\/06\/2023","format":false,"excerpt":"The year 2022 global wide ACE\u00a0data\u00a0outcome is about 29% lower than the\u00a0average over the 30 year-long (1991 through 2020)\u00a0climatology period tracked by Colorado\u00a0State University\u2019s Tropical\u00a0Meteorology Project data base.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/0image-29.webp?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/0image-29.webp?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/0image-29.webp?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/01\/0image-29.webp?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":411107,"url":"https:\/\/climatescience.press\/?p=411107","url_meta":{"origin":417032,"position":5},"title":"The AP Gets Hurricanes Wrong, Again, Melissa\u2019s Intensity Is Not Proof of Climate Change","author":"uwe.roland.gross","date":"10\/31\/2025","format":false,"excerpt":"In a widely published\u00a0Associated Press\u00a0(AP) article,\u00a0\u201cClimate change fuels Hurricane Melissa\u2019s rapid intensification to Category 5,\u201d\u00a0reporter Sibi Arasu claims that \u201cthe warming of the world\u2019s oceans caused by climate change helped double Hurricane Melissa\u2019s wind speed in less than 24 hours.\u201d This is highly misleading if not outright false. 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