Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9pm this evening.
-	There has been enough daytime heating to initiate thunderstorms which will have the potential to produce brief moderate and heavy rainfall through the afternoon. N to S storm motions of around 15-20mph will keep the majority of the heavier rainfall brief. Training of thunderstorm cells or a large, slower moving thunderstorm will have the potential to produce extended periods of heavy rain that may lead to excessive runoff.
-	Best chances for thunderstorms will be through about 8 or 9pm then lighter rain showers will continue likely into the evening.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce 0.1-0.3" of rain in 10-30 minutes. Moderate to strong thunderstorms will produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: Training of thunderstorm cells or a large, slower moving thunderstorm will have the potential to produce up to 1.6" in 45-60 minutes.

County	Message	Valid Times	Prime Time
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
Jefferson County	1	Current TO 900 PM	Current TO 800 PM
Broomfield County	1	Current TO 900 PM	Current TO 800 PM
Boulder County	1	Current TO 900 PM	Current TO 800 PM
Lakewood	1	Current TO 900 PM	Current TO 800 PM
Wheat Ridge	1	Current TO 900 PM	Current TO 800 PM
the City of Aurora	1	Current TO 900 PM	Current TO 800 PM
Arvada	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 SUN	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Arapahoe	Current TO 900 PM SUN	0.1" (95%) to 0.3" (75%) to 0.8" (35%)	ISSUED
Boulder	Current TO 900 PM SUN	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Broomfield	Current TO 900 PM SUN	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Denver	Current TO 900 PM SUN	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Douglas	Current TO 900 PM SUN	0.1" (100%) to 0.3" (75%) to 0.8" (35%)	ISSUED
Jefferson	Current TO 900 PM SUN	0.1" (100%) to 0.3" (80%) to 0.8" (40%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SUN	0.1" (100%) to 0.3" (70%) to 0.8" (40%)	ISSUED
Douglas	Current TO 900 PM SUN	0.1" (100%) to 0.3" (80%) to 0.8" (50%)	ISSUED
Jefferson	Current TO 900 PM SUN	0.1" (100%) to 0.3" (80%) to 0.8" (50%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.