{"id":12652,"date":"2020-08-05T10:22:00","date_gmt":"2020-08-05T16:22:00","guid":{"rendered":"https:\/\/www.coloradofloodthreat.com\/?p=12652"},"modified":"2020-08-06T07:16:11","modified_gmt":"2020-08-06T13:16:11","slug":"ftb-08-05-2020-severe-storms-round-2-for-the-plains","status":"publish","type":"post","link":"https:\/\/archive-coftb.dewberryanalytics.com\/?p=12652","title":{"rendered":"FTB 08-05-2020: Severe Storms Round 2 for the Plains"},"content":{"rendered":"<p>Issue Date: Wednesday, August 5th, 2020<br>\nIssue Time: 10:20AM MDT<\/p>\n<p><em>&mdash; A <strong>LOW<\/strong> flood threat has been issued for the Northeast Plains, Palmer Ridge, Southeast Plains, northern Urban Corridor, and northern\/southeast portions of the Front Range<\/em><\/p>\n<p>Today&rsquo;s weather setup is very similar to yesterday&rsquo;s as Colorado is situated between a high pressure ridge and a passing <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;shortwave&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A disturbance in the mid or upper part of the atmosphere which induces upward motion ahead of it.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>shortwave<\/span> to the northeast (see satellite graphic below). This high pressure center has shifted slightly east today, which is bringing some mid-level moisture from the south over western New Mexico, as seen by the clouds (blue) in the satellite image below. This moisture will slowly push into the southwestern part of the state today and increase chances for clouds and some showers over the San Juan Mountains, but 30Fs surface <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;dew points&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The temperature to which a given air parcel must be cooled (at constant pressure and water vapor content) in order for saturation to occur.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>dew points<\/span> over the area this morning indicate rainfall will be light and <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;isolated&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;less than 10% areal coverage&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>isolated<\/span>.<\/p>\n<p>The bigger story today is the <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;severe thunderstorms&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Thunderstorms that produce a tornado, winds of at least 58 mph (50 kts) and\/or hail at least 1&amp;quot; in diameter.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>severe thunderstorms<\/span> that are expected to track over the plains of eastern Colorado this afternoon. The height gradient between the high pressure ridge and the passing <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;shortwave trough&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A disturbance in the mid or upper part of the atmosphere which induces upward motion ahead of it.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>shortwave trough<\/span> is creating some moderate mid-level flow over the north\/northeast part of Colorado that is associated with an upper-level <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;jet streak&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The region of a jet stream with the strongest winds.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>jet streak<\/span>. This is causing some lift and generating clouds and showers (blue on the image below) over the northern and northeast part of the state this morning. This upper-level flow will continue over the northeastern part of the state today, which will increase <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;wind shear&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Local variation of the wind, either in the horizontal or vertical direction.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>wind shear<\/span> and favor more organized thunderstorms. This stronger upper-level flow will also push storms off to the east quicker, but heavy rainfall is still expected under the stronger storm cores.<\/p>\n<p>As the sun heats up the surface today, low pressure axis will develop over the high terrain and create upslope east-southeasterly surface winds for much of the plains. Surface <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;dew points&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The temperature to which a given air parcel must be cooled (at constant pressure and water vapor content) in order for saturation to occur.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>dew points<\/span> will remain in the mid to upper 50Fs for most of the lower, eastern elevations with higher 60Fs forecast for the far eastern plains as the moisture will continue to be banked up against the eastern mountains (see graphic below). This will help increase instability over the area this afternoon, and set the stage for heavy rainfall. However, due to slower upper-level flow farther south (less favorable upper-level dynamics), storms that can potentially break the <span class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;cap&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The area where a parcel of air has negative buoyancy or sinks. The intensity of the cap is measured by its convective inhibition. If the cap is sufficiently large, it may prevent thunderstorms from forming at all.&lt;\/div&gt;\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>cap<\/span> over the Southeast Plains should be more <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;isolated&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;less than 10% areal coverage&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>isolated<\/span> in nature, but still capable of producing high rainfall rates. So, the Low flood threat has been extended south.<\/p>\n<p>The highest chances for storms will be over the Northeast Plains and Palmer Ridge today. Max rain rates up to 1.6 in\/hr are possible with the storms, so a Low flood threat has been issued. Strong winds up to 65 mph are possible with the severe storms, especially over the Northeast Plains, and as storms develop further west, another round of severe hail up to (2 inch in diameter) is also possible.<\/p>\n<p><a href=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_graphic.png\"><img loading=\"lazy\" class=\"aligncenter wp-image-12653\" src=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_graphic.png\" alt=\"\" width=\"600\" height=\"504\" srcset=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_graphic.png 904w, https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_graphic-300x252.png 300w, https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_graphic-768x646.png 768w\" sizes=\"(max-width: 600px) 100vw, 600px\"\/><\/a><\/p>\n<h3><strong>Today&rsquo;s Flood Threat Map<br><\/strong><\/h3>\n<p>For more information on today&rsquo;s flood threat, see the map below. Hover over the threat areas for more details, and click on burn areas to learn more about them. For Zone-Specific forecasts, scroll below the threat map.<\/p>\n<p><a href=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_snap.png\"><img loading=\"lazy\" class=\"aligncenter wp-image-12665\" src=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_snap.png\" alt=\"\" width=\"880\" height=\"593\" srcset=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_snap.png 892w, https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_snap-300x202.png 300w, https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2020\/08\/FTB_20200805_snap-768x517.png 768w\" sizes=\"(max-width: 880px) 100vw, 880px\"\/><\/a><\/p>\n<h3><strong>Zone-Specific Forecasts:<br><\/strong><\/h3>\n<h4><strong>Northeast Plains, Southeast Plains, Palmer Ridge, Raton Ridge, Urban Corridor, Front Range, &amp; Southeast Mountains:<br><\/strong><\/h4>\n<p>Storms will fire around noon over the northern Front Range, Palmer Ridge, and Urban Corridor, and as they make their way east, they could become severe. There is also an increased chance for a squall line over the Northeast Plains, so strong, damaging winds will be possible. Back west, severe hail (up to 2 inches) will be possible. Max rain rates with storms over the plains this afternoon are 1.6 inches per hour, so a Low flood threat has been issued for the Northeast Plains, northern Urban Corridor, northern Front Range, Palmer Ridge, and portions of the Southeast Plains. Rain rates up to 1 in\/hr are more likely further west along the Front Range.<\/p>\n<p>A lower chance of storms is expected further south over the Southeast Plains, but a few <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;isolated&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;less than 10% areal coverage&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>isolated<\/span> strong storms could fire over the western part of the area if they can break through the <span class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;cap&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The area where a parcel of air has negative buoyancy or sinks. The intensity of the cap is measured by its convective inhibition. If the cap is sufficiently large, it may prevent thunderstorms from forming at all.&lt;\/div&gt;\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>cap<\/span> with help from other storms&rsquo; <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;outflow boundaries&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A surface boundary formed by the horizontal spreading of thunderstorm-cooled air. Outflow boundaries may intersect with each other or with other features (fronts, dry line, low-level jet) and initiate new convection. Brief strong winds are possible with outflow boundaries, and they can also persist for more than 24 hours.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>outflow boundaries<\/span>. Max 1-hour rain rates up to 1.6 inches will be possible. With the nocturnal <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;low-level jet&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A jet stream that is typically found in the lower 2&ndash;3 km of the atmosphere. At night, this may be referred to as the &amp;quot;nocturnal jet&rdquo; and help sustain storms.&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>low-level jet<\/span> along the southeastern border of Colorado, showers and storms may linger over the Southeast Plains into the overnight hours. These storms should be weaker due to limited instability, so flooding is not expected overnight.<\/p>\n<p>Primetime: 12PM to midnight<\/p>\n<h4><strong>Grand Valley, Northwest Slope, Northern Mountains, Central Mountains, Southwest Slope, San Luis Valley, &amp; San Juan Mountains:<br><\/strong><\/h4>\n<p>Mainly sunny for most of the region, but some afternoon clouds and weak showers are possible over the high terrain ridgelines. Best chance for rainfall will be over the San Juan Mountains where rain rates up to 0.1 inches per hour will be possible. Since most of the moisture will be in the mid-levels, the better bet is more cloud cover than wetting rainfall.<\/p>\n<p>Primetime: 12PM to 7PM<\/p>","protected":false},"excerpt":{"rendered":"<p>Issue Date: Wednesday, August 5th, 2020 Issue Time: 10:20AM MDT &mdash; A LOW flood threat has been issued for the Northeast Plains, Palmer Ridge, Southeast Plains, northern Urban Corridor, and northern\/southeast portions of the Front Range Today&rsquo;s weather setup is very similar to yesterday&rsquo;s as Colorado is situated between a high pressure ridge and a [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/12652"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12652"}],"version-history":[{"count":4,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/12652\/revisions"}],"predecessor-version":[{"id":12666,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/12652\/revisions\/12666"}],"wp:attachment":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}