Flash Flood Prediction Program

-	Message 1's continue valid for the entire District although the threat for thunderstorms is lower as precipitation thus far is favoring moderate to briefly heavy non-thunderstorm rain showers with short lived weak thunderstorms.
-	With temperatures in the 50's over much of the District precipitation is favoring a general rain with the stronger thunderstorm activity limited to the higher terrain well W of the District and further E onto the plains. The current rain and isolated weak thunderstorms showers are producing rainfall rates of 0.2-0.4" in 10-30 minutes on the heavy end and is resulting in minor runoff. If a moderate or strong thunderstorm is able to develop it will be very capable of producing brief heavy rain that may lead to excessive runoff and flash flooding.
-	Shower and weak thunderstorm activity is expected to continue to come in waves into the evening with conditions drying out around sunset or shortly after. It may not take as much rain today to produce runoff as the ground is saturated in some areas and smaller creeks and streams may be running high into the evening.

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

WORST CASE SCENARIO: A large slower moving thunderstorm or training of thunderstorm cells will have the potential to produce up to 1.6" in 45-75 minutes.

County	Message	Valid Times	Prime Time
Boulder 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
Douglas County	1	Current TO 900 PM	Current TO 800 PM
Adams County	1	Current TO 900 PM	Current TO 800 PM
Denver County	1	Current TO 900 PM	Current TO 800 PM
DIA	1	Current TO 900 PM	Current TO 800 PM
Arapahoe County	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
Wheat Ridge	1	Current TO 900 PM	Current TO 800 PM
Lakewood	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 SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Arapahoe	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Broomfield	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Denver	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.5" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.