FTB 09-24-2020: Dry Conditions & Above Average Temperatures

Issue Date: Thursday, September 24th, 2020
Issue Time: 9AM MDT

— Flooding is NOT expected today

Behind the departing trough on Wednesday, a much drier air mass filled in over the state as the ridge began to build (yellow in the image below). PW values corroborate this change and have dropped off since this time yesterday, measuring 0.45 and 0.53 inches at Denver and Grand Junction, respectively. As the High begins to move eastward throughout the day, Colorado will remain under its influence. So, this means dry conditions and above average temperatures.

The incoming shortwave (orange “X”) is providing some lift and increased moisture in a bit of a dirty ridge pattern, but the majority of this upper level cloud cover is north of the state and is producing no rainfall. The tail end of this feature is dipping into the northwest corner of the state and producing some cloud cover, but it’s already beginning to break up with a little heating. This feature will slowly track southeast today, which provide nothing more than broken cloud cover over the mountains. With the dry air mass well intact and subsidence around this feature continuing, rainfall is not forecast.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below. If there is a threat, 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.

Zone-Specific Forecasts:

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

Outside of broken, upper level cloud cover from the aforementioned feature, clear conditions are forecast today. Temperatures will also continue to be above normal with highs likely reaching 90F over the lower elevations. Over the mountains, temperatures will be about 10-15F cooler than that, so still warm. With upper level steering flow becoming more northerly, near surface smoke may increase over the Northeast Plains and Urban Corridor as well. Rainfall is not forecast.

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

It’s going to stay warm today with highs in the valleys reaching the upper 80Fs and mountain valleys reaching the 70Fs. The dry air mass and building High means there is no rainfall forecast. An upper level jet associated with the incoming trough may help produce some stronger winds over the northwest corner of the state. Wind speeds between 15 and 20 mph should be expected this afternoon with gusts slightly higher. Expect near surface winds to continue to increase and expand in coverage over the next couple of days. No rainfall is forecast today.