Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9pm.
-	Thunderstorms are beginning to develop in and around the District currently. A pseudo front moving in from the E/NE will enter the District shortly and is expected to trigger more numerous thunderstorms in the coming hours. Best chances for thunderstorm activity will be through sunset.
-	Thunderstorms will be slow moving and may remain stationary at times along gust front/outflow boundary interactions. Stronger thunderstorms will be capable of producing brief heavy rainfall and hail. A large, slower moving strong thunderstorm will be capable of producing an extended period of heavy rain that may lead to excessive runoff and possibly flash flooding.

STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce 0.1-0.3" of rain. Moderate to strong thunderstorms will have the potential to produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A large, slow moving thunderstorm will have the potential to produce up to 1.6" in 45-60 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 900 PM	300 PM TO 800 PM
Arvada	1	Current TO 900 PM	300 PM TO 800 PM
DIA	1	Current TO 900 PM	300 PM TO 800 PM
Arapahoe County	1	Current TO 900 PM	300 PM TO 800 PM
the City of Aurora	1	Current TO 900 PM	300 PM TO 800 PM
Denver County	1	Current TO 900 PM	300 PM TO 800 PM
Adams County	1	Current TO 900 PM	300 PM TO 800 PM
Douglas County	1	Current TO 900 PM	300 PM TO 800 PM
Broomfield County	1	Current TO 900 PM	300 PM TO 800 PM
Jefferson County	1	Current TO 900 PM	300 PM TO 800 PM
Wheat Ridge	1	Current TO 900 PM	300 PM TO 800 PM
Lakewood	1	Current TO 900 PM	300 PM TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Arapahoe	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Boulder	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Broomfield	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Denver	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Douglas	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Jefferson	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Douglas	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED
Jefferson	Current TO 900 PM SUN	0.1" (85%) to 0.3" (50%) to 0.8" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.