{"id":303496,"date":"2024-02-20T08:35:28","date_gmt":"2024-02-20T07:35:28","guid":{"rendered":"https:\/\/climatescience.press\/?p=303496"},"modified":"2024-02-20T08:35:31","modified_gmt":"2024-02-20T07:35:31","slug":"the-coming-collapse-of-el-nino-and-the-ramifications-on-the-atlantic-basin-tropical-season","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=303496","title":{"rendered":"The Coming Collapse Of El Nino and The Ramifications on The Atlantic Basin Tropical Season"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

Paul Dorian<\/strong><\/p>\n\n\n\n

\"\"
This forecast map by the North American Multi-Model Ensemble (NMME) of sea surface temperature anomalies for the August\/September\/October 3-month time period features colder-than-normal conditions (La Nina) across the equatorial Pacific Ocean. Map courtesy NOAA<\/em><\/figcaption><\/figure>\n\n\n\n

Overview<\/strong><\/p>\n\n\n\n

Above-normal sea surface temperatures continue this month across most of the equatorial part of the Pacific Ocean, but there are signs that this El Nino episode which began about a year ago will flip to La Nina conditions (colder-than-normal) by the early part of the 2024 summer season. A flip from El Nino to La Nino across the equatorial Pacific Ocean can have big implications on the upcoming 2024 Atlantic Basin tropical season. In fact, this expected dramatic change in sea surface temperatures across the Pacific Ocean may be a major contributor to a very active tropical season in the Atlantic Basin as atmospheric conditions are typically more favorable (lower wind shear) during La Nina episodes for the development and intensification of tropical storms. A second favorable factor for a very active tropical season in the Atlantic Basin is the likely continuation there of widespread warmer-than-normal sea surface temperatures.\u00a0Finally, as oceanic cycles play a critical role in global temperatures, a flip from El Nino to La Nina in the world\u2019s largest ocean could mean a return to closer-to-normal levels following a spike during the past year or so.\u00a0<\/p>\n\n\n\n

\"\"
The Multivariate ENSO Index (MEI), which combines both oceanic and atmospheric variables, facilitates in a single index an assessment of ENSO. It especially gives real-time indications of ENSO intensity, and through historical analysis \u2013 provides a context for meaningful comparative study of evolving conditions. The MEI is said to capture a more holistic representation of the atmospheric and oceanic anomalies that occur during ENSO events than do single-variables timeseries like the \u201cNinoSST\u201d indices. Plot courtesy NOAA\/PSL<\/em><\/figcaption><\/figure>\n\n\n\n

Details<\/strong><\/p>\n\n\n\n

A transition from El Nino to ENSO-neutral is likely by spring 2024 and odds are increasing for a full-blown La Nina by the time we get to the early summer which coincides with the beginning of the Atlantic Basin (includes Atlantic Ocean, Caribbean Sea, Gulf of Mexico) tropical season. This El Nino event began about a year ago following back-to-back-to-back years in which La Nina dominated the scene in the equatorial Pacific Ocean. For the past several years, most El Nino events have been rather short-lived lasting on average about 12-18 months whereas La Nina occurrences have usually lasted for a considerably longer periods of time.<\/p>\n\n\n\n

\"\"
Sub-surface temperatures: depth-longitude section of equatorial Pacific upper-ocean (0-300m) temperature anomalies (\u00b0C) centered on 28 January 2024. Colder-than-normal water is lurking just beneath the surface across much of the tropical Pacific and increases the chance for a return to La Nina. Map courtesy\u00a0<\/em>NOAA\/CPC<\/em><\/a>, International Research Institute<\/em><\/figcaption><\/figure>\n\n\n\n

While sea surface temperatures are currently at above-normal levels in the tropical Pacific Ocean, there are changes lurking just beneath the surface\u2026literally. Water temperatures in the 100 meters or so beneath the surface have averaged near normal in recent weeks, but below-average temperatures were widespread at greater depths. Also, in recent weeks, low-level winds were near average over the equatorial Pacific while upper-level wind anomalies were generally easterly over the east-central Pacific. Convection (i.e., thunderstorm activity) remained slightly enhanced in the central Pacific and close to average in areas to the west of there. Collectively, the coupled ocean-atmosphere system reflects an El Nino in an overall weakening phase.<\/p>\n\n\n\n

\"\"
Forecasts of sea surface temperature (SST) anomalies for the \u201cNino 3.4\u201d region (5 \u00b0N-5\u00b0S, 120\u00b0W-170\u00b0W) by a collection of computer forecast models. Courtesy NOAA, ECMWF, Canadian Met Centre,\u00a0<\/em>International Research Institute (IRI)<\/em><\/a><\/figcaption><\/figure>\n\n\n\n

In addition to oceanic and atmospheric\u00a0observational<\/em>\u00a0reasons to support the idea of a change in the near-term, numerous computer forecast models indicate a transition to \u201cENSO-neutral\u201d during the spring 2024 and then to La Nina during summer 2024. Specifically, temperatures in the \u201cEl Nino 3.4\u201d region (central part of the equatorial Pacific Ocean) are predicted to drop in most computer forecast models from the current 1.5-2.0\u00b0C higher-than-normal levels to near neutral during the spring season, and then down to 1.0 \u00b0C or so below-normal by the early part of the summer season.<\/p>\n\n\n\n

\"\"
Sea surface temperature anomalies centered for the week centered on 31 January 2024 reflect El Nino conditions with warmer-than-normal water in the equatorial Pacific Ocean. This is likely to change dramatically in coming weeks so that La Nina conditions (colder-than-normal) will dominate the scene by the summer (tropical) season in the Atlantic Basin. Map courtesy\u00a0<\/em>NOAA\/CPC<\/em><\/a>, International Research Institute<\/em><\/figcaption><\/figure>\n\n\n\n

In terms of impact on weather, El Nino has indeed contributed to a stormy winter season across California with numerous powerful ocean storms moving from the Pacific Ocean into the western part of the US and this unsettled pattern is likely to continue at least for the next few weeks. This enhanced storm activity in California is rather typical of an El Nino winter season with plenty of rain in low-lying sections and snow in the higher elevations. (By the way, what was\u00a0not\u00a0<\/em>typical was the\u00a0La Nina<\/em>\u00a0winter season of 2022-2023 in which California was pounded by numerous storms resulting in high rainfall amounts in low-lying sections and record snowfall in the higher elevations of the Sierra Nevada Mountains).<\/p>\n\n\n\n

\"\"
The El Nino region of the Pacific Ocean is sub-divided by meteorologists into sub-sections as outlined on this map with \u201cNino 3.4\u201d in the central part of the equatorial Pacific Ocean and \u201cNino 1+2\u201d positioned near the west coast of South America.<\/em><\/figcaption><\/figure>\n\n\n\n

In terms of an impact on the upcoming 2024 Atlantic Basin tropical season, La Nina conditions in the Pacific Ocean can be a critical contributing factor to what I fear could be a very active year in the Atlantic Ocean, Caribbean Sea, and Gulf of Mexico. In general, La Nina summer seasons feature lower wind shear levels across the breeding grounds of the Atlantic Ocean and this reduction is more favorable for the development and intensification of tropical storms (shear defined as change of wind speed and direction with height).<\/p>\n\n\n\n

\"\"
The likelihood of La Nina conditions this summer (tropical) season in the equatorial Pacific Ocean is a \u201cred flag\u201d for enhanced tropical activity in the Atlantic Basin. A second favorable factor for a very active season is the likelihood for continued warmer-than-normal sea surface temperatures in the breeding grounds of the tropical Atlantic. Map courtesy NOAA, tropicaltidbits.com<\/em><\/figcaption><\/figure>\n\n\n\n

In addition to the favorable aspect for tropical activity helped along by La Nina conditions in the Pacific, the breeding grounds of the tropical Atlantic Ocean are currently featuring much warmer-than-normal sea surface temperatures and this pattern is likely to continue right into the summer (tropical) season. Warmer-than-normal sea surface temperatures in the Atlantic Basin is favorable for tropical storm development and intensification. One final note on the potential impact of La Nina, oceanic cycles are critical in terms of global temperature patterns; especially, when dealing with the world\u2019s largest (Pacific) ocean. There has been a spike in global temperatures since the formation of this latest El Nino about a year ago and, if indeed, La Nina forms and is sustained \u2013 as is likely \u2013 then global temperatures are likely to return to much closer-to-normal levels.<\/p>\n\n\n\n

Meteorologist Paul Dorian
Arcfield
arcfieldweather.com<\/a><\/p>\n\n\n\n

Follow us on Facebook<\/a>, Twitter<\/a>, YouTube<\/a><\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Above-normal sea surface temperatures continue this month across most of the equatorial part of the Pacific Ocean, but there are signs that this El Nino episode which began about a year ago will flip to La Nina conditions (colder-than-normal) by the early part of the 2024 summer season. <\/p>\n","protected":false},"author":121246920,"featured_media":303509,"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":"","jetpack_seo_html_title":"","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":"Above-normal sea surface temperatures continue this month across most of the equatorial part of the Pacific Ocean, but there are signs that this El Nino episode which began about a year ago will flip to La Nina conditions (colder-than-normal) by the early","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":[691827030,691827028,691818200,691827029,691818830],"class_list":["post-303496","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-2024-atlantic-basin","tag-2024-summer-season","tag-el-nino","tag-el-nino-to-la-nina","tag-pacific-ocean","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/02\/0el-nino-la-nina.webp?fit=1200%2C800&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1gX6","jetpack-related-posts":[{"id":238258,"url":"https:\/\/climatescience.press\/?p=238258","url_meta":{"origin":303496,"position":0},"title":"Expert discusses La Ni\u00f1a and El Ni\u00f1o cycles effects on Australia","author":"uwe.roland.gross","date":"01\/07\/2023","format":false,"excerpt":"The\u00a0last El Ni\u00f1o\u00a0was 6-7 years ago, but elapsed time can\u2019t on its own be a guarantee of one this year. 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Yet the PWC response to external forcings is unclear\u2019.","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\/2023\/08\/0enso.jpg?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/08\/0enso.jpg?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/08\/0enso.jpg?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/08\/0enso.jpg?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/08\/0enso.jpg?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":439097,"url":"https:\/\/climatescience.press\/?p=439097","url_meta":{"origin":303496,"position":5},"title":"Is a Super El Nino Coming?","author":"uwe.roland.gross","date":"04\/13\/2026","format":false,"excerpt":"Forecasts are probabilistic, so plan for a range of outcomes rather than betting on the most dramatic scenario.","rel":"","context":"In \"dynamical models\"","block_context":{"text":"dynamical models","link":"https:\/\/climatescience.press\/?tag=dynamical-models"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Is-a-Super-El-Nino-Coming.jpg?fit=784%2C1168&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Is-a-Super-El-Nino-Coming.jpg?fit=784%2C1168&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Is-a-Super-El-Nino-Coming.jpg?fit=784%2C1168&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/04\/0-Is-a-Super-El-Nino-Coming.jpg?fit=784%2C1168&ssl=1&resize=700%2C400 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/303496","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=303496"}],"version-history":[{"count":6,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/303496\/revisions"}],"predecessor-version":[{"id":303510,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/303496\/revisions\/303510"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/media\/303509"}],"wp:attachment":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=303496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=303496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=303496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}