Flash Flood Prediction Program

-	Message 1's have been issued for the entire District until 9:00pm.
-	Thunderstorms have developed over the Jefferson County foothills late this morning and are approaching western portions of the District. Cold air aloft associated with an approaching Disturbance is allowing the atmosphere to destabilize despite cool temperatures at the surface. Early thunderstorms will favor the higher elevation western/southern areas of the District, while all areas will see a better chance of storms this afternoon.
-	Storms today will move to the E/SE at 12-17mph, but stronger storms could stall along outflow or wind convergence boundaries for a period of time. Dewpoints are in the mid 50s with PW values of around 0.9", which will result in heavy rainfall under stronger thunderstorms.

STORM RAINFALL POTENTIAL AND DURATION: Thunderstorms will be capable of producing rainfall of 0.5-1.5" in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving thunderstorm or training of thunderstorm cells could result in heavy rainfall of up to 3.0" in 90-120 minutes.

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

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Arapahoe	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Boulder	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Broomfield	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Denver	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Douglas	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Jefferson	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Douglas	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Jefferson	Current TO 900 PM TUE	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.