Flash Flood Prediction Program

-	Message 1's have been issued for the entire District until 10:00pm.
-	Thunderstorms have developed over the foothills just west of the District boundary, and are already producing moderate rainfall. These initial storms are expected to remain in the foothills, but outflow from this activity and other activity outside the District will likely trigger thunderstorms over the lower elevations this afternoon.
-	Higher moisture is in place today with dewpoints in the upper 40s to low 50s, and storm motions will be slow and erratic, resulting in a threat for heavy rainfall with stronger thunderstorms. Storms will have the potential to stall along outflow or wind convergence boundaries, which could result in excessive runoff. The threat for thunderstorms will persist into the evening before gradually decreasing in coverage and intensity after sunset.

STORM RAINFALL POTENTIAL AND DURATION: Thunderstorms will be capable of producing rainfall amounts of 0.4-1.2" in 10-30 minutes.

WORST CASE SCENARIO: A strong, slow-moving thunderstorm could produce heavy rainfall of up to 2.8" in 60-90 minutes.

County	Message	Valid Times	Prime Time
the City of Aurora	1	Current TO 1000 PM	Current TO 800 PM
Arapahoe County	1	Current TO 1000 PM	Current TO 800 PM
DIA	1	Current TO 1000 PM	Current TO 800 PM
Denver County	1	Current TO 1000 PM	Current TO 800 PM
Adams County	1	Current TO 1000 PM	Current TO 800 PM
Douglas County	1	Current TO 1000 PM	Current TO 800 PM
Broomfield County	1	Current TO 1000 PM	Current TO 800 PM
Jefferson County	1	Current TO 1000 PM	Current TO 800 PM
Boulder County	1	Current TO 1000 PM	Current TO 800 PM
Arvada	1	Current TO 1000 PM	Current TO 800 PM
Wheat Ridge	1	Current TO 1000 PM	Current TO 800 PM
Lakewood	1	Current TO 1000 PM	Current TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Arapahoe	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Boulder	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Broomfield	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Denver	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Douglas	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Jefferson	Current TO 1000 PM SUN	0.1" (90%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM SUN	0.1" (95%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Douglas	Current TO 1000 PM SUN	0.1" (95%) to 0.4" (60%) to 1.2" (25%)	ISSUED
Jefferson	Current TO 1000 PM SUN	0.1" (100%) to 0.4" (60%) to 1.2" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.