Time: 940 AM Sat September 9, 2023 Forecaster: Laura Smith

Heavy Precipitation Outlook
Flash Flood Prediction Program

HOT SUMMERTIME CONDITIONS WITH ISOLATED LATE AFTERNOON/EVENING THUNDERSTORMS
This morning will be sunny with afternoon highs reaching the mid to upper 80s, dew points in the mid to upper 30s, under mostly clear skies. Later this afternoon, an upper-level disturbance and its associated cold front will sweep across the area followed by a slight chance for late afternoon to early evening isolated showers and thunderstorms.
STORM RAINFALL POTENTIAL AND DURATION: Typical isolated thunderstorms will produce light rainfall of up to 0.25” in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm, although unlikely, has the potential to produce rainfall up to 0.50” in 45-60 minutes.

A LOOK AHEAD: The approaching system will support an unsettled weather pattern and much cooler temperatures through the middle of next week. Tomorrow will be partly cloudy and stormy with high temperatures in the low to mid 70s. Thunderstorms may persist from early afternoon through late evening. There is still some uncertainty about details and timing early next week, which will depend on the track of this system. We will continue to monitor this storm as it develops over the coming days.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Arapahoe 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Boulder 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Broomfield 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Denver 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Douglas 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Jefferson 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Foothills above 6500ft      
Boulder 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Douglas 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
Jefferson 400 PM TO 900 PM
Trace (50%) to 0.25" (30%) to 0.5" (10%) LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/