Flash Flood Prediction Program

-	Message 1's will continue valid until 9:00 PM.
-	A gust front is currently moving from N to S through the District which originated from thunderstorms over Larimer and Weld Counties. As this feature passes southward it will act as a trigger for additional thunderstorm development with thunderstorms currently in the Boulder/Broomfield and W Adams County area. New thunderstorms will likely develop southward as the afternoon progresses.
-	Typical thunderstorms will produce moderate to brief heavy rainfall with stronger storms cells capable of producing brief heavy rainfall that may lead to excessive runoff.

STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce 0.1-0.4" in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.2" in 10-30 minutes.

WORST CASE SCENARIO: Storms anchored to the foothills or surface boundary could produce up to 2.0" of heavy rain in 45-60 minutes.

County	Message	Valid Times	Prime Time
Wheat Ridge	1	1200 PM TO 900 PM	Current TO 800 PM
Lakewood	1	1200 PM TO 900 PM	Current TO 800 PM
Arvada	1	1200 PM TO 900 PM	Current TO 800 PM
the City of Aurora	1	1200 PM TO 900 PM	Current TO 800 PM
Arapahoe County	1	1200 PM TO 900 PM	Current TO 800 PM
DIA	1	1200 PM TO 900 PM	Current TO 800 PM
Denver County	1	1200 PM TO 900 PM	Current TO 800 PM
Adams County	1	1200 PM TO 900 PM	Current TO 800 PM
Douglas County	1	1200 PM TO 900 PM	Current TO 800 PM
Broomfield County	1	1200 PM TO 900 PM	Current TO 800 PM
Jefferson County	1	1200 PM TO 900 PM	Current TO 800 PM
Boulder County	1	1200 PM 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 THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Arapahoe	Current TO 900 PM THU	0.1" (75%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Boulder	Current TO 900 PM THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Broomfield	Current TO 900 PM THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Denver	Current TO 900 PM THU	0.1" (75%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (75%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.