{"id":24506,"date":"2024-10-25T08:07:35","date_gmt":"2024-10-25T15:07:35","guid":{"rendered":"https:\/\/nwac.us\/?p=24506"},"modified":"2024-10-25T08:07:36","modified_gmt":"2024-10-25T15:07:36","slug":"what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack","status":"publish","type":"post","link":"https:\/\/nwac.us\/2024\/10\/25\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\/","title":{"rendered":"What will La Ni\u00f1a mean for the Pacific Northwest mountain snowpack?"},"content":{"rendered":"\n<p>The Climate Prediction Center asserts: \u201cLa Ni\u00f1a is favored to emerge in September-November 2024 (60% chance) and is expected to persist through January-March 2025.\u201d Like most things in life, the devil is in the details. So how do we answer the questions you\u2019ve likely been daydreaming about? <em>Are we really going to get a La Ni\u00f1a winter? What will that mean for our snowpack?<\/em> We explore how the snowpack in our region responds to the 3-month moving average of Sea Surface Temperature (SST) anomalies in the middle of our winter season (also known as December-January-February or \u201cDJF\u201d anomalies).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1440\" src=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-scaled.jpg\" alt=\"\" class=\"wp-image-24536\" srcset=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-scaled.jpg 2560w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-300x169.jpg 300w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-1024x576.jpg 1024w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-768x432.jpg 768w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-1536x864.jpg 1536w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25075749\/2023.03.13-Art-Through-Adventure-17-edited-2048x1152.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\"><em><sub>Photo by Matt Patterson<\/sub><\/em><\/figcaption><\/figure>\n\n\n\n<p>The El Ni\u00f1o-Southern Oscillation (ENSO) is a period of fluctuation in SST and the air pressure of the overlying atmosphere across the equatorial Pacific Ocean. ENSO has three phases: El Ni\u00f1o, La Ni\u00f1a, and Neutral. The <a href=\"https:\/\/www.cpc.ncep.noaa.gov\/products\/analysis_monitoring\/enso_advisory\/strengths\/index.php\">October 10th CPC forecast<\/a> predicts the DJF anomaly this season will either be a 5% chance of a strong La Ni\u00f1a, 25% chance of a moderate La Ni\u00f1a, 41% chance of a weak La Ni\u00f1a, 29% chance of neutral conditions, or a 1% chance we enter weak El Ni\u00f1o conditions in early 2025. Quite a range of potential outcomes!<\/p>\n\n\n\n<p>Before your mind wanders too far with all these possibilities, let\u2019s compare the <em>percentage of normal<\/em> peak seasonal snow depth (inches) against the DJF anomaly strength (ENSO phase) using our snowpack climatology dataset.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>Snowpack Climatology Dataset<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"260\" src=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074613\/ENSO_Phase_Snow_Depth_High_Quality_v2-1024x260.png\" alt=\"\" class=\"wp-image-24524\" style=\"width:837px;height:auto\" srcset=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074613\/ENSO_Phase_Snow_Depth_High_Quality_v2-1024x260.png 1024w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074613\/ENSO_Phase_Snow_Depth_High_Quality_v2-300x76.png 300w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074613\/ENSO_Phase_Snow_Depth_High_Quality_v2-768x195.png 768w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074613\/ENSO_Phase_Snow_Depth_High_Quality_v2-1536x390.png 1536w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074613\/ENSO_Phase_Snow_Depth_High_Quality_v2.png 1684w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>A moderate La Ni\u00f1a tends to be quite favorable for snowfall along the west slopes and crest of the Cascades (&gt;110% of normal). Peak snow depth is markedly lower for a weak La Ni\u00f1a, except at Mission Ridge, but remains near normal. The outcome tilts slightly more negative in an ENSO neutral phase where slightly below normal conditions are favored at all stations except Timberline. Well-below-average peak snow depths (76-84% of normal) would be anticipated should we tip into a weak El Ni\u00f1o by January (1% chance). <em>Note that Mission Ridge (on the east slopes of the Cascades) has a weaker signal due to ENSO than the stations near or west of the Cascade Crest and therefore doesn\u2019t follow the same trend.&nbsp;<\/em><\/p>\n\n\n\n<p>If we look specifically at an average of the four sites with the longest and most robust data records (Mt Baker, Stevens Pass, Snoqualmie Pass, and Paradise), we can see the scatter of the data. The graph below illustrates the relationship between DJF SST anomalies and peak snow depths averaged across these sites. For every 1\u00b0C increase in SST anomaly, peak snow depth decreases by 1 foot. This relationship is statistically significant, with a p-value of 0.0052, confirming that warmer winters (associated with El Ni\u00f1o) lead to lower snowpacks across the Pacific Northwest. If you recall the recent 2023-24 season (star on the plot below), it was a shallower peak snowpack than we would have anticipated from the ENSO regression trendline.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"567\" src=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074722\/ENSO_Average_Snow_Depth-1024x567.png\" alt=\"\" class=\"wp-image-24525\" style=\"width:661px;height:auto\" srcset=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074722\/ENSO_Average_Snow_Depth-1024x567.png 1024w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074722\/ENSO_Average_Snow_Depth-300x166.png 300w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074722\/ENSO_Average_Snow_Depth-768x425.png 768w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074722\/ENSO_Average_Snow_Depth-1536x850.png 1536w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074722\/ENSO_Average_Snow_Depth.png 1789w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>If we zoom in a bit closer, we can see data in the range of possible outcomes for the 2024-25 winter:<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"567\" src=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074738\/ENSO_Average_Snow_Depth_subset-1024x567.png\" alt=\"\" class=\"wp-image-24526\" style=\"width:670px;height:auto\" srcset=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074738\/ENSO_Average_Snow_Depth_subset-1024x567.png 1024w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074738\/ENSO_Average_Snow_Depth_subset-300x166.png 300w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074738\/ENSO_Average_Snow_Depth_subset-768x425.png 768w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074738\/ENSO_Average_Snow_Depth_subset-1536x850.png 1536w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25074738\/ENSO_Average_Snow_Depth_subset.png 1789w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>All moderate and strong La Ni\u00f1a seasons in the dataset have peak snow depths greater than or equal to the mean for ENSO neutral. And all of these moderate and strong La Ni\u00f1a years exceed typical snow depth values of an El Ni\u00f1o year by 5% or more. All that to say, if the negative Sea Surface Temperature anomaly intensifies sufficiently, we\u2019re in store for a great season!<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1439\" src=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-scaled.jpg\" alt=\"\" class=\"wp-image-24543\" srcset=\"https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-scaled.jpg 2560w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-300x169.jpg 300w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-1024x576.jpg 1024w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-768x432.jpg 768w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-1536x863.jpg 1536w, https:\/\/files.nwac.us\/wp-content\/uploads\/2024\/10\/25080300\/240204_PATTERSON_09072-2-edited-2048x1151.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\"><em><sub>Photo by Matt Patterson<\/sub><\/em><\/figcaption><\/figure>\n\n\n\n<p>Some less-than-stellar snowpack years start coming into the mix as we head into the most probable ENSO phases for the 2024-25 season\u2013a weak or neutral La Ni\u00f1a\u2013with little to no weighting on the dice. Some of the worst seasons in PNW history have occurred in a weak El Ni\u00f1o, so fingers crossed the Ni\u00f1o 3.4 region of the Pacific Ocean (where we measure ENSO SST anomalies)&nbsp; doesn&#8217;t enter El Ni\u00f1o territory by January. Fortunately, the odds of that are very low!&nbsp;<\/p>\n\n\n\n<p><strong>To summarize, the strength of an anticipated La Ni\u00f1a ENSO phase has a major influence on our chances for an above-average snow season in our forecast zones. A moderate La Ni\u00f1a or stronger gives us very high chances of normal to above normal peak snowpacks. Whereas a weak La Ni\u00f1a or ENSO neutral conditions give us a range of potential outcomes close to the overall average for our region.<\/strong><\/p>\n\n\n\n<p>So if you want to load the dice in favor of a cold, snowy winter in our mountains, root for strong upwelling of cold water off the coast of South America!<\/p>\n\n\n\n<p>____________<\/p>\n\n\n\n<p><strong>Disclaimers:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The datasets are not fully quality-controlled.<\/li>\n\n\n\n<li>The impact of long-term climatic changes has not been incorporated into this study, but preliminary analysis suggests that ENSO impacts remain larger than the overall climate trends.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The Climate Prediction Center asserts: \u201cLa Ni\u00f1a is favored to emerge in September-November 2024 (60% chance) and is expected to persist through January-March 2025.\u201d Like most things in life, the devil is in the details. So how do we answer the questions you\u2019ve likely been daydreaming about? Are we really going to get a La [&hellip;]<\/p>\n","protected":false},"author":86,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-24506","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What will La Ni\u00f1a mean for the Pacific Northwest mountain snowpack? - Northwest Avalanche Center<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nwac.us\/2024\/10\/25\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What will La Ni\u00f1a mean for the Pacific Northwest mountain snowpack? - Northwest Avalanche Center\" \/>\n<meta property=\"og:description\" content=\"The Climate Prediction Center asserts: \u201cLa Ni\u00f1a is favored to emerge in September-November 2024 (60% chance) and is expected to persist through January-March 2025.\u201d Like most things in life, the devil is in the details. So how do we answer the questions you\u2019ve likely been daydreaming about? Are we really going to get a La [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nwac.us\/2024\/10\/25\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\/\" \/>\n<meta property=\"og:site_name\" content=\"Northwest Avalanche Center\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-25T15:07:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-10-25T15:07:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/nwac.us\/wp-content\/uploads\/2024\/10\/2023.03.13-Art-Through-Adventure-17-edited-scaled.jpg\" \/>\n<meta name=\"author\" content=\"Liz Daniel\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Liz Daniel\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nwac.us\\\/2024\\\/10\\\/25\\\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nwac.us\\\/2024\\\/10\\\/25\\\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\\\/\"},\"author\":{\"name\":\"Liz Daniel\",\"@id\":\"https:\\\/\\\/nwac.us\\\/#\\\/schema\\\/person\\\/6ae47458e87e5a905296c0747376f73f\"},\"headline\":\"What will La Ni\u00f1a mean for the Pacific Northwest mountain snowpack?\",\"datePublished\":\"2024-10-25T15:07:35+00:00\",\"dateModified\":\"2024-10-25T15:07:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nwac.us\\\/2024\\\/10\\\/25\\\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\\\/\"},\"wordCount\":816,\"image\":{\"@id\":\"https:\\\/\\\/nwac.us\\\/2024\\\/10\\\/25\\\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/nwac.us\\\/wp-content\\\/uploads\\\/2024\\\/10\\\/2023.03.13-Art-Through-Adventure-17-edited-scaled.jpg\",\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/nwac.us\\\/2024\\\/10\\\/25\\\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\\\/\",\"url\":\"https:\\\/\\\/nwac.us\\\/2024\\\/10\\\/25\\\/what-will-la-nina-mean-for-the-pacific-northwest-mountain-snowpack\\\/\",\"name\":\"What will La Ni\u00f1a mean for the Pacific Northwest mountain snowpack? 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So how do we answer the questions you\u2019ve likely been daydreaming about? 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