{"id":16207,"date":"2021-09-21T09:18:57","date_gmt":"2021-09-21T15:18:57","guid":{"rendered":"https:\/\/www.coloradofloodthreat.com\/?p=16207"},"modified":"2021-09-22T07:29:42","modified_gmt":"2021-09-22T13:29:42","slug":"spm-09-21-2021","status":"publish","type":"post","link":"https:\/\/archive-coftb.dewberryanalytics.com\/?p=16207","title":{"rendered":"SPM 09-21-2021: Much Cooler Day with Showers in Mountains and Eastern Colorado"},"content":{"rendered":"<p>Issue Date: Tuesday, September 21st, 2021<br>\nIssue Time: 10:15 AM MDT<\/p>\n<h3>Summary:<\/h3>\n<p>Monday was a much cooler day than we&rsquo;ve been experiencing lately, with highs only in the 60s and low 70s for the Western Slopes, Grand Valley, Urban Corridor, Southeast Mountains, San Juan Valley and Eastern Plains, and 50s for the Northern, Central and San Juan Mountains. In fact, overnight and early morning lows have been some of the coolest that have been seen since late spring. <\/p>\n<p>In terms of precipitation, the morning kicked off with the end of the <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;trough&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;An elongated area of relatively low atmospheric pressure; the opposite of a ridge.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>trough<\/span> axis that brought these big changes exiting the Northwest Plains and any lingering light showers dissipating. However, further west early morning showers and even light snow was falling over the Northern and Central mountains. Precipitation totals for the high elevations vary from 0.01-0.40 inches <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;scattered&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;25-40% areal coverage&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>scattered<\/span> across the region. <\/p>\n<p>By early afternoon, a weak front interacting with the Palmer <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Divide&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;textColor&amp;quot;:&amp;quot;white&amp;quot;} --&amp;gt;\n&amp;lt;p class=&amp;quot;has-white-color has-text-color&amp;quot;&amp;gt;the dividing line that separates the watersheds of the western and eastern United States; rivers west of the divide empty into the Pacific Ocean, while rivers east of the divide empty into the Atlantic Ocean or Gulf of Mexico&amp;lt;\/p&amp;gt;\n&amp;lt;!-- \/wp:paragraph --&amp;gt;&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>Divide<\/span> north of Colorado Springs brought light precipitation to the Urban Corridor and Palmer Ridge. As the afternoon progressed, storms became more <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;widespread&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;greater than 60% areal coverage&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>widespread<\/span> over Palmer Ridge and Urban Corridor, and expanding out to the Northeast and Southeast Plains by evening and overnight hours. Precipitation totals were modest and rainfall rates remained light enough to prevent any runoff. Some notable totals from <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;CoCoRaHS&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;textColor&amp;quot;:&amp;quot;white&amp;quot;} --&amp;gt;\n&amp;lt;p class=&amp;quot;has-white-color has-text-color&amp;quot;&amp;gt;&amp;lt;strong&amp;gt;Co&amp;lt;\/strong&amp;gt;mmunity &amp;lt;strong&amp;gt;Co&amp;lt;\/strong&amp;gt;llaborative &amp;lt;strong&amp;gt;Ra&amp;lt;\/strong&amp;gt;in, &amp;lt;strong&amp;gt;H&amp;lt;\/strong&amp;gt;ail, and &amp;lt;strong&amp;gt;S&amp;lt;\/strong&amp;gt;now Network, a volunteer network of precipitation observers across the country&amp;lt;\/p&amp;gt;\n&amp;lt;!-- \/wp:paragraph --&amp;gt;&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>CoCoRaHS<\/span> observers across the eastern half of the state include <strong>0.37 inches in Denver<\/strong>, though mostly surrounding by 0.05-0.15 inch totals, <strong>0.28 inches in Black Forest, and 0.20 inches in Limon and Brush<\/strong>. <\/p>\n<blockquote class=\"twitter-tweet tw-align-center\">\n<p lang=\"en\" dir=\"ltr\">Anyone note the strange substance falling from the sky? A couple bands of light rain out there. Latest radar loop (darker greens and light yellows denote precipitation reaching ground). Snow level ranges from around 8000 feet WY border to 8500 ft I-70 Corridor. <a href=\"https:\/\/twitter.com\/hashtag\/COwx?src=hash&amp;ref_src=twsrc%5Etfw\">#COwx<\/a> <a href=\"https:\/\/t.co\/th8E2znNVo\">pic.twitter.com\/th8E2znNVo<\/a><\/p>\n<p>&mdash; <span class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;NWS&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;National Weather Service&lt;\/div&gt;\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>NWS<\/span> Boulder (@NWSBoulder) <a href=\"https:\/\/twitter.com\/NWSBoulder\/status\/1440162166762471424?ref_src=twsrc%5Etfw\">September 21, 2021<\/a><\/p><\/blockquote>\n<p> <script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>No flooding was reported on Monday. For rainfall estimates in your area, check out the State Precipitation Map below. <\/p>\n<p><em>The Pueblo radar is currently being upgraded and is offline for the next few weeks, so radar-based precipitation estimates for Southeast Colorado are having to rely on further radars in Denver, New Mexico, Texas, and Kansas. This will result in precipitation being underestimated for this region. More information the radar upgrade can be found <a href=\"https:\/\/www.weather.gov\/pub\/RadarUpgrade\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a>. <\/em><\/p>\n<h4 class=\"collapseomatic \" id=\"id6a1c4f957f882\" tabindex=\"0\" title=\"Click Here For Map Overview\">Click Here For Map Overview<\/h4><div id=\"target-id6a1c4f957f882\" class=\"collapseomatic_content \">\nThe map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (<span class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;QPE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;lt;strong&amp;gt;Q&amp;lt;\/strong&amp;gt;uantitative &amp;lt;strong&amp;gt;P&amp;lt;\/strong&amp;gt;recipitation &amp;lt;strong&amp;gt;E&amp;lt;\/strong&amp;gt;stimate; an estimate of the amount of precipitation that has fallen at a particular location or across a region based on several different data sources, such as radar or satellite; QPE is often calculated using remotely-sensed data sources&lt;\/div&gt;\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>QPE<\/span>) across Colorado. The map is updated daily during the operational season (May 1 &ndash; Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;flash flooding&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;textColor&amp;quot;:&amp;quot;white&amp;quot;} --&amp;gt;\n&amp;lt;p class=&amp;quot;has-white-color has-text-color&amp;quot;&amp;gt;flash flooding can refer to usually dry areas becoming rapidly inundated with water, or rapid water level rises on streams, creeks, or rivers beyond flood stage; typically caused by heavy rainfall, but can also be caused by meltwater&amp;lt;\/p&amp;gt;\n&amp;lt;!-- \/wp:paragraph --&amp;gt;&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>flash flooding<\/span> may have occurred). The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.\n<\/div>\n<p><img loading=\"lazy\" src=\"http:\/\/www.dewberry-hydromet.com\/STP\/Snapshots\/SPM\/SPM_20210921_snap.png\" width=\"880\" height=\"616\" class=\"alignnone size-large\"\/><\/p>","protected":false},"excerpt":{"rendered":"<p>Issue Date: Tuesday, September 21st, 2021 Issue Time: 10:15 AM MDT Summary: Monday was a much cooler day than we&rsquo;ve been experiencing lately, with highs only in the 60s and low 70s for the Western Slopes, Grand Valley, Urban Corridor, Southeast Mountains, San Juan Valley and Eastern Plains, and 50s for the Northern, Central and [&hellip;]<\/p>","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/16207"}],"collection":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16207"}],"version-history":[{"count":6,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/16207\/revisions"}],"predecessor-version":[{"id":16216,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/16207\/revisions\/16216"}],"wp:attachment":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}