Flash Flood Prediction Program

-	Message 1's will continue valid for the entire District until 9:00pm.
-	Strong to severe thunderstorms have largely remained just north and northeast of the District this afternoon. There are enough wind and moisture boundaries in place that additional storms could impact the District through the early evening hours, favoring northern and eastern areas. Strong storms will remain capable of producing brief heavy rains.
-	The best chance of storms across the District will be through early evening, before tapering off after sunset.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers and weak to moderate storms will produce TR-0.3" in 10-30 minutes. Strong thunderstorms could produce rainfall of 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving strong thunderstorm or training of strong thunderstorm cells may result in up to 1.4" in 45-60 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 900 PM	Current TO 800 PM
Jefferson County	1	Current TO 900 PM	Current TO 800 PM
Broomfield County	1	Current TO 900 PM	Current TO 800 PM
Douglas County	1	Current TO 900 PM	Current TO 800 PM
Adams County	1	Current TO 900 PM	Current TO 800 PM
Denver County	1	Current TO 900 PM	Current TO 800 PM
DIA	1	Current TO 900 PM	Current TO 800 PM
Arapahoe County	1	Current TO 900 PM	Current TO 800 PM
the City of Aurora	1	Current TO 900 PM	Current TO 800 PM
Arvada	1	Current TO 900 PM	Current TO 800 PM
Wheat Ridge	1	Current TO 900 PM	Current TO 800 PM
Lakewood	1	Current TO 900 PM	Current TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM FRI	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED
Arapahoe	Current TO 900 PM FRI	0.1" (70%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Boulder	Current TO 900 PM FRI	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED
Broomfield	Current TO 900 PM FRI	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED
Denver	Current TO 900 PM FRI	0.1" (70%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Douglas	Current TO 900 PM FRI	0.1" (65%) to 0.3" (25%) to 0.8" (10%)	ISSUED
Jefferson	Current TO 900 PM FRI	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM FRI	0.1" (70%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Douglas	Current TO 900 PM FRI	0.1" (70%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Jefferson	Current TO 900 PM FRI	0.1" (70%) to 0.3" (30%) to 0.8" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.