Time: 901 AM Mon September 9, 2024 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

Warm, mostly sunny with a slight chance of a few high based showers/thunderstorms this afternoon and evening.
A slight shift in the upper-level flow aloft today will bring more westerly flow aloft over the region today as high-pressure continues to churn over the desert southwest. Mild and dry conditions are expected throughout most of the day today under mostly sunny skies.

Another very slight chance this afternoon for a few high-based showers and possibly a thunderstorm or two. Most storm activity will remain anchored to the foothills, likely mixing out as they move eastward and onto the plains. Once again, the majority of, if not all precipitation will struggle to reach the surface, resulting in gusty sprinkles rather than any meaningful rainfall within the District. The best chance for storm activity will be from 2-8pm with skies starting to clear by sundown.

Overnight temperatures will drop into the upper 50s to around 60 degrees on the plains with mid to upper 50s along the foothills.
STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce between a trace and 0.10” total in 10-30 minutes.

WORST CASE SCENARIO: A moderate to strong shower/isolated thunderstorm will have the potential to produce 0.10”-0.30” total in 10-30 minutes.

A LOOK AHEAD: Westerly upper-level flow aloft continues bringing another mostly mild and dry day tomorrow as high temperatures reach the upper 80s to around 90 degrees. Another slight chance for a few high-based showers and possibly a weak thunderstorm or two, mainly along the higher terrain foothills and Palmer Divide. A relatively weak disturbance will move into the region Wednesday, bringing a slightly better chance for afternoon showers and thunderstorms with minimal chances for any heavy rainfall at this time.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Arapahoe 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Boulder 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Broomfield 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Denver 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Douglas 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Jefferson 300 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE
Foothills above 6500ft      
Boulder 200 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE
Douglas 200 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE
Jefferson 200 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/