{"id":391,"date":"2024-05-16T03:09:18","date_gmt":"2024-05-16T03:09:18","guid":{"rendered":"https:\/\/climate.colostate.edu\/blog\/?p=391"},"modified":"2024-05-16T03:17:31","modified_gmt":"2024-05-16T03:17:31","slug":"ramping-up-to-peak-severe-thunderstorm-and-tornado-season-in-colorado","status":"publish","type":"post","link":"https:\/\/climate.colostate.edu\/blog\/index.php\/2024\/05\/16\/ramping-up-to-peak-severe-thunderstorm-and-tornado-season-in-colorado\/","title":{"rendered":"Ramping up to peak severe thunderstorm and tornado season in Colorado"},"content":{"rendered":"\n<p>The midwest and south have been very active with severe weather lately, but it&#8217;s been relatively quiet here in Colorado so far. But we&#8217;ve reached the middle of May, which is the time of year when the threat for severe thunderstorms and tornadoes in Colorado rises rapidly. In this blog post, we&#8217;ll walk through some of the interesting aspects of Colorado&#8217;s severe weather climatology, and what history shows about what we could expect in the coming months. (If you like to explore data on your own, you can jump right over to the <a href=\"https:\/\/climate.colostate.edu\/severe_wx_climatology.html\" target=\"_blank\" rel=\"noreferrer noopener\">set of severe weather maps and graphs on our website<\/a>.)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Where does severe weather tend to happen in Colorado?<\/h3>\n\n\n\n<p>First, let&#8217;s look at <em><strong>where<\/strong><\/em> severe weather happens in Colorado. (Below is a static map, but do check out the interactive map on the website where you can zoom in, select specific hazard types, etc.) The first thing you likely notice from this map is that severe storms happen a lot more frequently in eastern Colorado than on the western slope. This probably isn&#8217;t a huge surprise. There are four ingredients required to get severe thunderstorms: moisture and instability in the atmosphere, a mechanism to lift the air, and vertical wind shear (the change in wind speed and\/or direction as you go up in height). Those ingredients are in place a lot more often in eastern Colorado than to the west &#8212; especially the moisture and instability. It&#8217;s tough to get enough moisture for really intense thunderstorms up in the high country.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"658\" src=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/co_severe_wx_reports-1-1024x658.png\" alt=\"\" class=\"wp-image-392\" srcset=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/co_severe_wx_reports-1-1024x658.png 1024w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/co_severe_wx_reports-1-300x193.png 300w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/co_severe_wx_reports-1-768x493.png 768w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/co_severe_wx_reports-1.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em>Map showing reports of tornado (red), severe hail (green), and severe thunderstorm wind gusts (blue) in Colorado from 1955-2022. Visit the interactive version at: <a href=\"https:\/\/climate.colostate.edu\/severe_storms.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/climate.colostate.edu\/severe_storms.html <\/a><\/em><\/figcaption><\/figure>\n\n\n\n<p>Now, if you look even closer at the map of reports, you might notice some other interesting patterns. For example, in southeast Colorado, can you pick out Highway 50? Your eye might also be drawn to clusters along the Front Range urban corridor, or even other roads. There&#8217;s not any reason to believe that hail falls more frequently on highways than in open fields: instead, this demonstrates that the primary source of severe weather data is reports made by people, so there are more reports where people tend to be! (More of them in cities and on roadways, fewer in rural areas away from towns and major roads.)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When does severe weather tend to happen in Colorado?<\/h3>\n\n\n\n<p>Next, we can take a look at when during the year that severe weather reports tend to happen. The black lines in these graphs show a smoothed version of the average number of reports per day. For tornadoes, the frequency ramps up through May and reaches a peak in early June, with a slow decline through the summer and into the fall. The graph for severe hail looks similar, but shifted a little later: the peak is in mid-June. The graph for severe wind reports looks a little strange, though, with a big spike on a particular day. That spike comes from the <a href=\"https:\/\/www.weather.gov\/bou\/20200606Derecho\" target=\"_blank\" rel=\"noreferrer noopener\">unusual derecho that swept across the country on June 6, 2020<\/a>. Just in Colorado, there were 137 reports of severe thunderstorm winds (58 mph or stronger) and 36 reports of winds exceeding 75 mph on that one day, far more than any other day in Colorado records.<sup data-fn=\"5ac24b69-d0c7-4421-b7a2-39b2e7989f17\" class=\"fn\"><a href=\"#5ac24b69-d0c7-4421-b7a2-39b2e7989f17\" id=\"5ac24b69-d0c7-4421-b7a2-39b2e7989f17-link\">1<\/a><\/sup> That single storm system was able to alter what the severe weather climatology looks like in Colorado!<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-1-1024x819.png\" alt=\"\" class=\"wp-image-395\" srcset=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-1-1024x819.png 1024w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-1-300x240.png 300w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-1-768x614.png 768w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-1.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em>Distribution of the average number of tornado, hail, and wind reports in Colorado across the year. Visit the interactive version at: <a href=\"https:\/\/climate.colostate.edu\/svr_reports_dist.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/climate.colostate.edu\/svr_reports_dist.html<\/a><\/em><\/figcaption><\/figure>\n\n\n\n<p>Another way to look at the data, which smooths out the effect of individual rare events, is &#8220;severe weather days&#8221;: the number of days that had one or more report of a particular hazard. The tornado and hail graphs look pretty similar to the ones above, but now the wind graph is better behaved. It shows that severe thunderstorm wind gusts are more frequent later in the summer, with a peak in early to mid-July. (An important note is that this only considers wind gusts produced by thunderstorms. Other types of intense wind tend to happen in the <a href=\"https:\/\/climate.colostate.edu\/blog\/index.php\/2024\/04\/09\/an-impressive-april-windstorm\/\" target=\"_blank\" rel=\"noreferrer noopener\">winter and spring<\/a>.)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-2-1024x819.png\" alt=\"\" class=\"wp-image-397\" srcset=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-2-1024x819.png 1024w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-2-300x240.png 300w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-2-768x614.png 768w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/newplot-2.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em>Distribution of the average number of days per year with tornado, hail, and wind reports in Colorado across the year. Visit the interactive version at: <a href=\"https:\/\/climate.colostate.edu\/svr_days_dist.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/climate.colostate.edu\/svr_days_dist.html<\/a><\/em><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2023 was a very active year<\/h2>\n\n\n\n<p>We&#8217;re still awaiting the final compilation of data from NOAA for 2023, but we know that it was one of the most active years for Colorado severe weather in recent times. You might remember the <a href=\"https:\/\/www.cpr.org\/2023\/06\/22\/dozens-injured-seven-hospitalized-intense-hail-storm-interrupts-red-rocks-concert\/\" target=\"_blank\" rel=\"noreferrer noopener\">Red Rocks hailstorm<\/a>, the <a href=\"https:\/\/www.weather.gov\/bou\/Tornadoes_June_21_2023\" target=\"_blank\" rel=\"noreferrer noopener\">historic number of tornadoes in northeast Colorado on June 21<\/a>, the <a href=\"https:\/\/www.denverpost.com\/2023\/06\/29\/late-night-hail-unusual-northeast-colorado\/?share=wu6tegeu2rsuaoleaant\" target=\"_blank\" rel=\"noreferrer noopener\">unusual late-night hailstorm on June 28<\/a>, or the <a href=\"https:\/\/www.9news.com\/article\/weather\/severe-weather\/tornado-near-yuma-colorado\/73-316d9226-b61b-4a83-ac9d-2c88af481105\" target=\"_blank\" rel=\"noreferrer noopener\">Yuma County tornado on August 8 that was rated EF-3<\/a>. Later in the evening of August 8, <a href=\"https:\/\/www.ncei.noaa.gov\/monitoring-content\/extremes\/scec\/reports\/20230926-Colorado-Hailstone.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">a new state record hailstone, 5.25 inches in diameter<\/a>, was collected in Yuma County by a storm chaser.<\/p>\n\n\n\n<p>Especially when it comes to hail, 2023 was a year for the record books, with the largest number of reports on record across every size category. (Keep in mind, though, that hailstorms have not been consistently recorded over time, and population has grown, so it&#8217;s tough to look at trends of hail reports over the long term. The 2023 data are also still awaiting final confirmation.)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"542\" src=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/Screenshot-2024-05-15-at-1.05.04\u202fPM-1024x542.png\" alt=\"\" class=\"wp-image-401\" style=\"width:608px;height:auto\" srcset=\"https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/Screenshot-2024-05-15-at-1.05.04\u202fPM-1024x542.png 1024w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/Screenshot-2024-05-15-at-1.05.04\u202fPM-300x159.png 300w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/Screenshot-2024-05-15-at-1.05.04\u202fPM-768x407.png 768w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/Screenshot-2024-05-15-at-1.05.04\u202fPM-720x380.png 720w, https:\/\/climate.colostate.edu\/blog\/wp-content\/uploads\/2024\/05\/Screenshot-2024-05-15-at-1.05.04\u202fPM.png 1169w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to get severe weather warnings; how to submit reports<\/h2>\n\n\n\n<p>If severe weather is in the forecast, it&#8217;s important to have more than one way to get warnings from the National Weather Service. Make sure that <a href=\"https:\/\/www.weather.gov\/wrn\/wea\" target=\"_blank\" rel=\"noreferrer noopener\">Wireless Emergency Alerts (WEA) <\/a>are active on your phone. Get a <a href=\"https:\/\/www.weather.gov\/nwr\/\" target=\"_blank\" rel=\"noreferrer noopener\">NOAA Weather Radio,<\/a> especially for times when you might be outside of cell service, like when camping. Follow your local broadcast meteorologists and your local National Weather Service office. Think about the <a href=\"https:\/\/www.noaa.gov\/safeplaceselfie\" target=\"_blank\" rel=\"noreferrer noopener\">safe place <\/a>where you, your family, and your pets can go if a warning is issued.<\/p>\n\n\n\n<p>If severe weather happens to occur in your area, you can also help by reporting what happened to the National Weather Service. They accept reports over social media, or if you&#8217;re especially dedicated you can get trained to be a <a href=\"https:\/\/www.weather.gov\/skywarn\/\">Skywarn spotter<\/a>, submit reports on your phone using <a href=\"https:\/\/mping.nssl.noaa.gov\" target=\"_blank\" rel=\"noreferrer noopener\">mPING<\/a>, or join the Community Collaborative Rain, Hail, and Snow (<a href=\"https:\/\/cocorahs.org\" target=\"_blank\" rel=\"noreferrer noopener\">CoCoRaHS<\/a>) network where you can submit detailed information about hail, heavy rain, and other hazardous weather. All of these reports are useful both for knowing what is happening while storms are ongoing, and for researchers to understand how to make better forecasts and warnings in the future.<\/p>\n\n\n\n<p>In future posts, we&#8217;ll take a deeper dive into some of the most unusual and highest-impact storms that have occurred in Colorado in its history, and other interesting aspects of the severe weather climatology.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Further reading<\/h2>\n\n\n\n<p>For further reading, check out this paper by former CSU PhD student Sam Childs: <br>Childs, S. J., and R. S. Schumacher, 2019: An Updated Severe Hail and Tornado Climatology for Eastern Colorado.\u00a0<em>J. Appl. Meteor. Climatol.<\/em>,\u00a0<strong>58<\/strong>, 2273\u20132293,\u00a0<a href=\"https:\/\/doi.org\/10.1175\/JAMC-D-19-0098.1\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1175\/JAMC-D-19-0098.1<\/a>.<\/p>\n\n\n<ol class=\"wp-block-footnotes\"><li id=\"5ac24b69-d0c7-4421-b7a2-39b2e7989f17\">The previous highest number of thunderstorm wind reports on a day was 30 severe reports (58+ mph), and 7 &#8220;significant&#8221; (75+mph) severe reports.  <a href=\"#5ac24b69-d0c7-4421-b7a2-39b2e7989f17-link\" aria-label=\"Jump to footnote reference 1\">\u21a9\ufe0e<\/a><\/li><\/ol>","protected":false},"excerpt":{"rendered":"<p>The midwest and south have been very active with severe weather lately, but it&#8217;s been relatively quiet here in Colorado so far. But we&#8217;ve reached the middle of May, which is the time of year when the threat for severe thunderstorms and tornadoes in Colorado rises rapidly. In this blog post, we&#8217;ll walk through some [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":392,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"[{\"content\":\"The previous highest number of thunderstorm wind reports on a day was 30 severe reports (58+ mph), and 7 \\\"significant\\\" (75+mph) severe reports. \",\"id\":\"5ac24b69-d0c7-4421-b7a2-39b2e7989f17\"}]"},"categories":[20,38,39,34],"tags":[36,35,37,33],"class_list":["post-391","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate-context","category-hail","category-tornado","category-wind","tag-hail","tag-severe-weather","tag-tornado","tag-wind"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ramping up to peak severe thunderstorm and tornado season in Colorado - Colorado Climate Blog<\/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:\/\/climate.colostate.edu\/blog\/index.php\/2024\/05\/16\/ramping-up-to-peak-severe-thunderstorm-and-tornado-season-in-colorado\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ramping up to peak severe thunderstorm and tornado season in Colorado - Colorado Climate Blog\" \/>\n<meta property=\"og:description\" content=\"The midwest and south have been very active with severe weather lately, but it&#8217;s been relatively quiet here in Colorado so far. But we&#8217;ve reached the middle of May, which is the time of year when the threat for severe thunderstorms and tornadoes in Colorado rises rapidly. 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