Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and be valid until 8:00 pm this evening.
-	With surface temperatures warming rapidly and dew points in the low 50's to 60, thunderstorms are already beginning to develop over the higher terrain. Thunderstorms will become more numerous over the coming hours with 2-3 rounds of storms likely into the evening. The first 1-2 rounds will have the highest potential to produce heavy rainfall.
-	Storm movement will be from W/SW to E/NE at 5-15mph, with the potential for some erratic storm movement for storms formed from outflow boundaries.

STORM RAINFALL POTENTIAL AND DURATION: Typical weak to moderate thunderstorms will produce 0.1-0.3" of rain. Strong thunderstorms will have the potential to produce 0.3-1.2" of heavy rain in 10-30 minutes

WORST CASE SCENARIO: A large, slower moving or stationary strong thunderstorm may produce up to 2.4" of rain in 45-60 minutes.

County	Message	Valid Times	Prime Time
Lakewood	1	Current TO 800 PM	Current TO 700 PM
Wheat Ridge	1	Current TO 800 PM	Current TO 700 PM
Arvada	1	Current TO 800 PM	Current TO 700 PM
the City of Aurora	1	Current TO 800 PM	Current TO 700 PM
Arapahoe County	1	Current TO 800 PM	Current TO 700 PM
DIA	1	Current TO 800 PM	Current TO 700 PM
Denver County	1	Current TO 800 PM	Current TO 700 PM
Adams County	1	Current TO 800 PM	Current TO 700 PM
Douglas County	1	Current TO 800 PM	Current TO 700 PM
Broomfield County	1	Current TO 800 PM	Current TO 700 PM
Jefferson County	1	Current TO 800 PM	Current TO 700 PM
Boulder County	1	Current TO 800 PM	Current TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 800 PM SUN	0.1" (60%) to 0.3" (50%) to 1.2" (15%)	ISSUED
Arapahoe	Current TO 800 PM SUN	0.1" (60%) to 0.3" (50%) to 1.2" (20%)	ISSUED
Boulder	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED
Broomfield	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED
Denver	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED
Douglas	Current TO 800 PM SUN	0.1" (60%) to 0.3" (50%) to 1.2" (20%)	ISSUED
Jefferson	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED
Douglas	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED
Jefferson	Current TO 800 PM SUN	0.1" (60%) to 0.3" (40%) to 1.2" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.