FTB 09-05-2021: A Sunny Sunday For Most

Issue Date: Sunday, September 5th, 2021
Issue Time: 9:00AM MDT

Flooding is NOT expected today

The long advertised drying has finally occurred in earnest across Colorado overnight. Dewpoint temperatures have dropped anywhere from 5F-25F statewide, with the most significant drying over northern Colorado. Precipitable Water (PW) has dropped below 0.5 inches at both Denver and Grand Junction. As shown in the water vapor image, below, northwesterly flow around a strengthening Four Corners ridge will continue to stream very dry air into the state. Seasonable temperatures are expected this afternoon, despite the ample sunshine. A bit of smoky air could make it into northern Colorado this afternoon, but heavier smoke concentrations are expected to hold off until Monday and Tuesday.

An isolated shower or weak storm cannot be ruled out over southeastern Colorado, mainly in Baca County as well as the southernmost portion of the Southeast Mountains. However, with strong steering winds and limited boundary layer moisture, only light accumulation would occur if a storm did manage to pop. Thus, flooding is NOT expected today.

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 Plains, Raton Ridge and Southeast Mountains:

Mostly sunny and seasonably warm this afternoon with an isolated shower or weak storm possible over Baca County, as well as the NM border portion of the Southeast Mountains. Max 1-hour rainfall up to 0.4 inches (Baca County) and 0.2 inches (Southeast Mountains). Flooding is NOT expected today.
Primetime: 2PM through 9PM

Southwest Slope, Grand Valley, Northwest Slope, Central Mountains, Northern Mountains, San Juan Mountains, San Luis Valley, Front Range, Urban Corridor, Palmer Ridge and Northeast Plains:

Mostly sunny and seasonably warm today. Flooding is NOT expected.