Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9:00 PM this evening.
-	Moderate to strong thunderstorms that develop this afternoon will be very capable of producing heavy rainfall that may lead to excessive runoff roadways and possibly flash flooding.
-	Prime time for thunderstorm activity is from 12:00-8:00 PM. More numerous showers and thunderstorms will favor the foothills and Palmer Divide but the stronger storms are expected to favor the plains. Slow storm motions from SW to NE and potential training of thunderstorm cells will be the main culprits for extended periods of heavy rainfall.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.2" in 10-30 minutes. Weak thunderstorms will produce rainfall rates of 0.2-0.6" in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce 0.6-1.8" in 10-30 minutes.

WORST CASE SCENARIO: A large thunderstorm complex or a slow moving large thunderstorm may result in up to 3.0" of rain in 45-75 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	1100 AM TO 900 PM	1200 PM TO 800 PM
Jefferson County	1	1100 AM TO 900 PM	1200 PM TO 800 PM
Broomfield County	1	1100 AM TO 900 PM	1200 PM TO 800 PM
Douglas County	1	1100 AM TO 900 PM	1200 PM TO 800 PM
Adams County	1	1100 AM TO 900 PM	100 PM TO 800 PM
Denver County	1	1100 AM TO 900 PM	100 PM TO 800 PM
DIA	1	1100 AM TO 900 PM	100 PM TO 800 PM
Arapahoe County	1	1100 AM TO 900 PM	100 PM TO 800 PM
the City of Aurora	1	1100 AM TO 900 PM	100 PM TO 800 PM
Arvada	1	1100 AM TO 900 PM	1200 PM TO 800 PM
Wheat Ridge	1	1100 AM TO 900 PM	1200 PM TO 800 PM
Lakewood	1	1100 AM TO 900 PM	1200 PM TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Arapahoe	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Boulder	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Broomfield	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Denver	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Douglas	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Jefferson	1200 PM TO 900 PM	0.2" (80%) to 0.8" (40%) to 1.6" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM WED	0.2" (90%) to 0.8" (50%) to 1.6" (15%)	ISSUED
Douglas	Current TO 900 PM WED	0.2" (90%) to 0.8" (50%) to 1.6" (15%)	ISSUED
Jefferson	Current TO 900 PM WED	0.2" (90%) to 0.8" (50%) to 1.6" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.