Flash Flood Prediction Program

Message 1’s continue valid until 8:00pm but the threat for thunderstorms has greatly diminished behind the initial round of strong storms. Cooler temperatures in the 50’s to lower 60’s are responsible for a much lower thunderstorm threat as the atmosphere has stabilized.

Additional rain showers may re-develop into the evening, but the thunderstorm threat is very low, however, should a thunderstorm be able to develop brief heavy rainfall is possible as moisture levels remain high.

Message 1’s are expected to be allowed to expire at 8:00pm this evening.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.1” of rain. Weak to moderate thunderstorms will have the potential to produce 0.1-0.4” in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm is able to develop in a cool air mass with the potential to produce 0.4-1.2” in 10-30 minutes.

County	Message	Valid Times	Prime Time
Jefferson County	1	1200 PM TO 800 PM	100 PM TO 700 PM
Boulder County	1	1200 PM TO 800 PM	100 PM TO 700 PM
the City of Aurora	1	1200 PM TO 800 PM	100 PM TO 700 PM
Arapahoe County	1	1200 PM TO 800 PM	100 PM TO 700 PM
DIA	1	1200 PM TO 800 PM	100 PM TO 700 PM
Denver County	1	1200 PM TO 800 PM	100 PM TO 700 PM
Adams County	1	1200 PM TO 800 PM	100 PM TO 700 PM
Douglas County	1	1200 PM TO 800 PM	100 PM TO 700 PM
Broomfield County	1	1200 PM TO 800 PM	100 PM TO 700 PM
Lakewood	1	1200 PM TO 800 PM	100 PM TO 700 PM
Wheat Ridge	1	1200 PM TO 800 PM	100 PM TO 700 PM
Arvada	1	1200 PM TO 800 PM	100 PM TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Arapahoe	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Boulder	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Broomfield	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Denver	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Douglas	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Jefferson	Current TO 800 PM WED	0.01" (50%) to 0.2" (25%) to 0.4" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 800 PM WED	0.01" (60%) to 0.2" (30%) to 0.4" (15%)	ISSUED
Douglas	Current TO 800 PM WED	0.01" (60%) to 0.2" (30%) to 0.4" (15%)	ISSUED
Jefferson	Current TO 800 PM WED	0.01" (60%) to 0.2" (30%) to 0.4" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.