FTB 09-18-2017: Statewide Drying brings Plentiful Sunshine and Warm Temperatures

Issue Date: Monday, September 18, 2017
Issue Time: 10:05 AM MDT

— Flooding is NOT expected today

The visible satellite image below shows mostly clear skies over the state with the exception of the northeast corner of the state where fog was reported earlier this morning. This quickly burned off with the increasing temperatures post sunrise. Aloft, a more zonal pattern will dominate the weather this morning and turn more southwesterly this afternoon. The southwesterly flow will continue to dry out the upper levels and mix out surface moisture throughout the day. The highest dew points, over the eastern plains, are only expected to be in the 40s by later this afternoon and will decrease rapidly to the west. Precipitable Water (PW) values this morning were measured around 0.55 inches for both Denver and Grand Junction.

With the drying, we expect rainfall totals today to range from none to minimal. The best chances for measurable rain will be west of the Continental Divide over the higher terrains, but totals are expected to be under 0.1 inches. Higher temperatures statewide are also forecasted with highs over the lower elevations reaching the mid-80s and the mountains reaching the 70s. As the next system approaches from the Pacific Northwest, surface winds will start increasing tomorrow with the tight gradient. A fire weather watch is in place and is expected to become a Red Flag Warning tomorrow. On and off breezy conditions are expected through Friday. More details on the critical fire danger situation will be in tomorrow’s FTB.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below (hover over threat areas for more details). For Zone-Specific forecasts, scroll below the map.

Zone-Specific Forecasts:

Front Range, Urban Corridor, Northeast Plains, Palmer Ridge, Southeast Mountains, Raton Ridge, Southeast Plains:

Sunny throughout the day with some cloud cover over the mountains this afternoon. An isolated shower may be possible later this afternoon or evening, but only trace amounts of precipitation are expected. Winds are expected to start increasing from the southwest tonight. Flooding is not expected today.

Primetime: 3PM to 9PM

Northwest Slope, Grand Valley, Southwest Slope, Northern Mountains, Central Mountains, San Luis Valley, San Juan Mountains, Central Mountains:

Sunny this morning with increasing clouds over the higher terrains this afternoon. Drying will limit shower coverage this afternoon, but some isolated showers over the climatologically favored regions may occur. Storm totals are expected to be under 0.1 inches. Flooding is not expected today.

Primetime: 1PM to 9PM