Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9pm this evening. Storm have begun to develop along the foothills at this time and will continue to build before moving onto the plains this afternoon.
-	Current dew points are at an elevated mid to upper 50's with low 60's just east of the District. This suggests the chance for heavy rainfall, even out of weak to moderate storms. Storm motions today will also be fairly slow to nearly stationary at times from west to east. This will increase the chance for isolated heavy rain with the potential for flash flooding. Roadways/smaller creeks and streams will be most prone to excessive runoff/flooding today.
-	Best chance for storms in the District will be between 1-9pm.A few lingering showers and thunderstorms could be possible after 9pm, mainly for areas out on the eastern plains. Drier upper-level air begins to move in behind todays disturbance which will gradually clear skies through the evening.

STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce 0.2-0.5" of rain in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce heavy rainfall rates of 0.5-1.5" in 10-30 minutes

WORST CASE SCENARIO: Training of thunderstorm cells or a large slow moving strong thunderstorm may result in very heavy rainfall of up to 3.0" in 60-90 minutes. Should rain continue for longer than 90 minutes in duration higher amounts are possible.

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

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Arapahoe	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Boulder	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Broomfield	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Denver	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Douglas	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Jefferson	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (20%)	ISSUED
Douglas	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (20%)	ISSUED
Jefferson	Current TO 900 PM FRI	0.2" (75%) to 0.5" (50%) to 1.5" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.