Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid through 10:00pm.
-	Abundant surface moisture along and north of a wind convergence line with dew points in the 50's will fuel strong to severe thunderstorms this afternoon and evening. One to two rounds of storms are likely with strong storms capable of producing heavy rainfall and severe weather in the form of strong winds and large hail.
-	Thunderstorms will move fairly rapidly from SSW to NNE at 25-35mph. Training of strong thunderstorm cells will produce the greatest threat for extended periods of heavy rainfall that may lead to excessive runoff and flash flooding.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak to moderate thunderstorms will produce 0.1-0.4". Strong thunderstorms will have the potential to produce up to 0.4-1.0" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving strong thunderstorm or training of strong thunderstorm cells may result in up to 2.0" in 45-75 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 1000 PM	400 PM TO 900 PM
Jefferson County	1	Current TO 1000 PM	400 PM TO 900 PM
Broomfield County	1	Current TO 1000 PM	400 PM TO 900 PM
Douglas County	1	Current TO 1000 PM	400 PM TO 900 PM
Adams County	1	Current TO 1000 PM	400 PM TO 900 PM
Denver County	1	Current TO 1000 PM	400 PM TO 900 PM
DIA	1	Current TO 1000 PM	400 PM TO 900 PM
Arapahoe County	1	Current TO 1000 PM	400 PM TO 900 PM
the City of Aurora	1	Current TO 1000 PM	400 PM TO 900 PM
Arvada	1	Current TO 1000 PM	400 PM TO 900 PM
Wheat Ridge	1	Current TO 1000 PM	400 PM TO 900 PM
Lakewood	1	Current TO 1000 PM	400 PM TO 900 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (25%)	ISSUED
Arapahoe	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (25%)	ISSUED
Boulder	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Broomfield	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Denver	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (25%)	ISSUED
Douglas	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Jefferson	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Douglas	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Jefferson	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (50%) to 1.0" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.