Flash Flood Prediction Program

Message 1’s will be allowed to expire at 8pm as the threat of heavy rainfall has come to an end.

Storms just outside of the District have initially stabilized the region with any shower activity falling apart along the higher terrain, but a gust front is currently moving through the District. This gust front has initiated storms north of Denver but haven't produced any Message level rainfall. This gust front has a chance to produce additional storms within the Distrist over the next couple of hours. Overnight skies will gradually with lows dropping into the 60s.

The combination of continued lack of upper-level support, warmer temperatures, and decreasing moisture, should significantly decrease the risk of any heavy rainfall amounts across the District tomorrow. There still will be slight chance of a couple isolated short-lived thunderstorms within the District during the afternoon to early evening, but these storms will likley not be able to produce Message level rainfall amounts.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace-0.10” total in 10-30 minutes. A moderate shower will produce 0.10-0.20” total in 10-30 minutes.

WORST CASE SCENARIO: A thunderstorm will have the potential to produce 0.20-0.40” total in 10-30 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 800 PM	Current TO 800 PM
Jefferson County	1	Current TO 800 PM	Current TO 800 PM
Broomfield County	1	Current TO 800 PM	Current TO 800 PM
Douglas County	1	Current TO 800 PM	Current TO 800 PM
Adams County	1	Current TO 800 PM	Current TO 800 PM
Denver County	1	Current TO 800 PM	Current TO 800 PM
DIA	1	Current TO 800 PM	Current TO 800 PM
Arapahoe County	1	Current TO 800 PM	Current TO 800 PM
the City of Aurora	1	Current TO 800 PM	Current TO 800 PM
Arvada	1	Current TO 800 PM	Current TO 800 PM
Wheat Ridge	1	Current TO 800 PM	Current TO 800 PM
Lakewood	1	Current TO 800 PM	Current TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM WED	Trace (30%) to 0.2" (15%) to 0.4" (5%)	ISSUED
Arapahoe	Current TO 1000 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Boulder	Current TO 1000 PM WED	Trace (30%) to 0.2" (15%) to 0.4" (5%)	ISSUED
Broomfield	Current TO 1000 PM WED	Trace (30%) to 0.2" (15%) to 0.4" (5%)	ISSUED
Denver	Current TO 1000 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Douglas	Current TO 1000 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Jefferson	Current TO 1000 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM WED	Trace (30%) to 0.2" (15%) to 0.4" (5%)	ISSUED
Douglas	Current TO 1000 PM WED	Trace (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Jefferson	Current TO 1000 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.