{"id":1338,"date":"2015-07-20T14:02:35","date_gmt":"2015-07-20T20:02:35","guid":{"rendered":"https:\/\/www.coloradofloodthreat.com\/?p=1338"},"modified":"2015-07-20T14:02:35","modified_gmt":"2015-07-20T20:02:35","slug":"fto-07-20-2015-two-elevated-flood-threat-events-separated-by-hot-and-dry-periods","status":"publish","type":"post","link":"https:\/\/archive-coftb.dewberryanalytics.com\/?p=1338","title":{"rendered":"FTO 07-20-2015: Two Elevated Flood Threat Events Separated by Hot and Dry Periods"},"content":{"rendered":"<p>Issue Date: 7\/20\/2015<br>\nIssue Time: 1:52 PM<\/p>\n<p><a href=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/07\/Threat_Timeline_20150720.png\"><img loading=\"lazy\" class=\"  wp-image-1337 aligncenter\" src=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/07\/Threat_Timeline_20150720.png\" alt=\"Threat_Timeline_20150720\" width=\"868\" height=\"118\"\/><\/a><\/p>\n<p>The next 15-day period is much like many of those before it, as an active storm track remains over the United States, albeit slightly offset further to the north. This means that fewer <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> disturbances will track across Colorado during this FTO period as the active storm track invades northern states for a few weeks; only the strongest disturbances\/upper-level troughs will be able to push back against the summertime high-pressure ridge. The first event marks two days in which the remnants of Hurricane Dolores are the main focus, and the second event will be the result of an upper-level <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> able to push back against the ridge, bringing a fairly extended wet period from a monsoonal surge of moisture. Without further ado, let&rsquo;s get right to it&hellip;<\/p>\n<ul><li>Event #1: Tuesday (07-21) and Wednesday (07-22)\n<ul><li>Remnants of Hurricane Dolores (circled in white, #1) will keep Colorado sufficiently moist through Tuesday, with moisture waning as we move through Wednesday and into Thursday. The upper-level ridge over the south-central US (circled in blue) will continue to retrograde westward, cutting off the moist, southwest flow and drying out Colorado through Saturday with very little precipitation expected.<\/li>\n<\/ul><\/li>\n<li>Event #2: Sunday (7-26) through Friday (07-31)\n<ul><li>Event #2 is still gathering itself over the Bering Sea, so it is not quite in the view of our water vapor imagery below. This upper-level <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> is forecast to begin working down the west coast of Canada on Friday, bringing southwest, monsoonal flow back to Colorado by late Saturday\/early Sunday as it forces the upper-level ridge to the east, once again. This will provide an extended wet period (through Friday the 31st) before the main <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> slides north and east of Colorado and the upper-level ridge retrogrades and regains its dominance over our weather.<\/li>\n<\/ul><\/li>\n<\/ul><p><a href=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/07\/WV_20150720.png\"><img loading=\"lazy\" class=\"  wp-image-1336 aligncenter\" src=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/07\/WV_20150720.png\" alt=\"WV_20150720\" width=\"477\" height=\"319\"\/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h3><strong>Event #1: Tuesday (07-21) and Wednesday (07-22)<\/strong><\/h3>\n<p><em><span style=\"color: #ff6600;\">Elevated Flood Threat<\/span>, Mainly for Burn Scars, Urban Areas, and <span class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;unstable&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 atmosphere is considered unstable if it is conducive to air attempting to rise; the opposite of stable; an unstable atmosphere is necessary for thunderstorms&amp;lt;\/p&amp;gt;\n&amp;lt;!-- \/wp:paragraph --&amp;gt;&lt;\/div&gt;\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'>Unstable<\/span> Terrain as Remnants of Dolores Move Overhead<\/em><\/p>\n<p>Remnants of Hurricane Dolores will keep Colorado sufficiently moist through Tuesday, with moisture waning as we move through Wednesday and into Thursday. The most active day will be Tuesday thanks to the presence of deeper moisture, a passing weak disturbance, and greater instability as compared to Wednesday. Three-fourths or more of the total rainfall forecast for this two-day event will fall on Tuesday.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/a.tiles.mapbox.com\/v4\/sgeiger.mp329064\/attribution,zoompan,zoomwheel,geocoder,share.html?access_token=pk.eyJ1Ijoic2dlaWdlciIsImEiOiJmNjc5a3RBIn0.LbLupVkJsS5dbo9fsgrTDg\" width=\"100%\" height=\"500px\" frameborder=\"0\"><\/iframe><\/p>\n<p><a href=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/05\/Legend.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-230\" src=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/05\/Legend.png\" alt=\"Legend\" width=\"94\" height=\"158\"\/><\/a><\/p>\n<h3><strong>Event #2: Sunday (7-26) through Friday (07-31)<\/strong><\/h3>\n<p><em><span style=\"color: #ff6600;\">Elevated Flood Threat<\/span> as Upper-Low and Monsoonal Surge Create an Extended Wet Period<\/em><\/p>\n<p>Southwest, monsoonal flow will return to Colorado on Friday the 18th as an upper-level <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> begins to work down the west coast of Canada, forcing the upper-level ridge to the east, once again. This extended cool, wet period will last for several days before the main <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> moves north and east of Colorado and the upper-level ridge cuts off the monsoonal flow.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/a.tiles.mapbox.com\/v4\/sgeiger.mp32bkp7\/attribution,zoompan,zoomwheel,geocoder,share.html?access_token=pk.eyJ1Ijoic2dlaWdlciIsImEiOiJmNjc5a3RBIn0.LbLupVkJsS5dbo9fsgrTDg\" width=\"100%\" height=\"500px\" frameborder=\"0\"><\/iframe><\/p>\n<p><a href=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/05\/Legend.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-230\" src=\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/05\/Legend.png\" alt=\"Legend\" width=\"94\" height=\"158\"\/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Issue Date: 7\/20\/2015 Issue Time: 1:52 PM The next 15-day period is much like many of those before it, as an active storm track remains over the United States, albeit slightly offset further to the north. This means that fewer <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> disturbances will track across Colorado during this FTO period as the active storm track [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/1338"}],"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=1338"}],"version-history":[{"count":1,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/1338\/revisions"}],"predecessor-version":[{"id":1339,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/1338\/revisions\/1339"}],"wp:attachment":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}