{"id":10845,"date":"2019-09-15T06:43:25","date_gmt":"2019-09-15T12:43:25","guid":{"rendered":"https:\/\/www.coloradofloodthreat.com\/?p=10845"},"modified":"2019-10-14T09:33:17","modified_gmt":"2019-10-14T15:33:17","slug":"ftb-09-15-2019-subtropical-moisture-returns","status":"publish","type":"post","link":"https:\/\/archive-coftb.dewberryanalytics.com\/?p=10845","title":{"rendered":"FTB 09-15-2019: Subtropical Moisture Returns"},"content":{"rendered":"

Issue Date: 9\/15\/2019
\nIssue Time: 6:50 AM<\/p>\n

A MODERATE FLOOD THREAT HAS BEEN ISSUED FOR PORTIONS OF THE SAN JUAN MOUNTAINS, SOUTHWEST SLOPE, AND SOUTHEAST MOUNTAINS.<\/em>
A LOW FLOOD THREAT HAS BEEN ISSUED FOR PORTIONS OF THE REGIONS ABOVE, AS WELL AS PORTIONS OF THE SAN LUIS VALLEY AND CENTRAL MOUNTAINS.<\/em><\/p>\n

A subtropical disturbance, currently situated over AZ\/NM will shift north\/northeastward throughout the forecast period, bringing enhanced moisture and broad-scale lift to Colorado later today and tonight. The greatest impacts will be felt over the High Country and south of I-70, where the best moisture and support for thunderstorms will coincide. Precipitable water<\/span> values will increase to 0.8-1.0 inches today\/tonight over portions of the Southwest Slope, San Juan Mountains, and Southeast Mountains, and this amount of available moisture is the driver behind today’s moderate flood threat area. North of I-70, a few isolated<\/span> storms will rumble, resulting in gusty winds and brief periods of rainfall.<\/p>\n

\"\"<\/a><\/p>\n

East of the mountains, the increase in mid-level moisture will result mainly in more cloud cover than the previous few days. A couple stray showers\/thunderstorms will move off of the higher terrain late this afternoon and during the evening hours, mainly south of I-70, producing gusty winds and brief periods of light-to-moderate rainfall. Otherwise, it will be mostly sunny and warm again today. For more details on rain rates and timing, please see our zone-specific forecasts below.<\/p>\n

Today’s Flood Threat Map<\/strong><\/h3>\n

For more information on today’s flood threat, see the map below. For Zone-Specific forecasts, jump below the map.<\/p>\n

 <\/p>\n

\"\"<\/a><\/div>\n
\"Flood<\/div>\n

Zone-Specific Forecasts<\/strong><\/h3>\n

Urban Corridor, Northeast Plains, Southeast Plains, Palmer Ridge, and Raton Ridge:<\/strong><\/h4>\n

Mostly sunny, warm, and dry for most, with only a few stray showers\/thunderstorms possible for areas along\/near the higher terrain and mainly south of I-70. Storm motions will be fairly quick to the north, mitigating the flash flood<\/span> risk from heavy rainfall. With that said, street\/field ponding is possible under the strongest storms. Maximum rain rates will be 0.6-1.0 inches\/hour, with most likely rain rates below 0.5 inches\/hour.<\/p>\n

Timing: 3 PM – 11 PM<\/p>\n

Front Range, Northern Mountains, and Northwest Slope:<\/strong><\/h4>\n

A few more clouds than the last few days is expected as moisture streams into Colorado from the southwest. These regions will be furthest removed from broad-scale lift induced by the subtropical disturbance, so only a couple isolated<\/span> showers\/thunderstorms are expected late in the afternoon and into the nighttime hours. Rain rates will be below 0.3 inches\/hour.<\/p>\n

Timing: 4 PM – 11 PM<\/p>\n

Southeast Mountains, San Luis Valley, San Juan Mountains, and Southwest Slope:<\/strong><\/h4>\n

Scattered<\/span> showers\/thunderstorms will begin to move into the Southwest Slope and San Juan Mountains around lunchtime today, developing north\/east with time. Peak thunderstorm activity will occur between 2 PM and 9 PM but expect scattered<\/span> showers with a few embedded thunderstorms to continue into tomorrow morning. Most rain rates will be 0.2-0.4 inches\/hour, but thunderstorms could produce rain rates up to 0.8-1.2 inches\/hour. Storm motions will mitigate the flash flood<\/span> risk somewhat, but a moderate flood threat is warranted, and burn scars deserve a close eye.<\/p>\n

Timing: Noon – 10 AM tomorrow<\/p>\n

Grand Valley and Central Mountains:<\/strong><\/h4>\n

Mostly sunny to start, with clouds increasing just after lunchtime as moisture spreads in from the south. Most activity will be garden-variety, producing gusty winds and periods of light rainfall (less than 0.25 inches\/hour), but a stronger storm will be possible over southern portions of the Central Mountains (up to 0.4-0.75 inches\/hour), hence its inclusion in the low flood threat. A few isolated<\/span> showers will continue into the early morning hours tomorrow, mainly over the higher terrain of the Central Mountains.<\/p>\n

Timing: 2 PM – 6 AM<\/p>","protected":false},"excerpt":{"rendered":"

Issue Date: 9\/15\/2019 Issue Time: 6:50 AM A MODERATE FLOOD THREAT HAS BEEN ISSUED FOR PORTIONS OF THE SAN JUAN MOUNTAINS, SOUTHWEST SLOPE, AND SOUTHEAST MOUNTAINS. A LOW FLOOD THREAT HAS BEEN ISSUED FOR PORTIONS OF THE REGIONS ABOVE, AS WELL AS PORTIONS OF THE SAN LUIS VALLEY AND CENTRAL MOUNTAINS. A subtropical disturbance, currently […]<\/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\/10845"}],"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=10845"}],"version-history":[{"count":4,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/10845\/revisions"}],"predecessor-version":[{"id":11085,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=\/wp\/v2\/posts\/10845\/revisions\/11085"}],"wp:attachment":[{"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/archive-coftb.dewberryanalytics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}