Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 10pm this evening. An upper level disturbance will move through this afternoon and is expected to produce isolated to widely scattered showers and thunderstorms into the evening. Strong thunderstorms will be capable of producing brief heavy rainfall.
-	Showers and thunderstorms will move from SW to NE at around 20mph helping to limit point rainfall amounts from a single storm. Outflow boundaries from storms outside the District may help to anchor or slow down a stronger storm resulting in an extended period of heavy rainfall which may lead to excessive runoff.
-	Best chances for thunderstorm activity will be through 9 or 10pm this evening. Beyond 10pm additional rain showers and weaker thunderstorms remain possible until about midnight.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.3" of rain. Moderate to strong thunderstorms will have the potential to produce 0.3-0.9" in 10-30 minutes.

WORST CASE SCENARIO: Moisture levels remain higher than anticipated resulting in moderate to strong thunderstorms with the potential to produce heavy rainfall of 0.5-1.5" in 10-30 minutes and up to 2.5" in 45-60 minutes.

County	Message	Valid Times	Prime Time
Broomfield County	1	Current TO 1000 PM	100 PM TO 900 PM
Jefferson County	1	Current TO 1000 PM	100 PM TO 900 PM
Boulder County	1	Current TO 1000 PM	100 PM TO 900 PM
Douglas County	1	Current TO 1000 PM	100 PM TO 900 PM
Adams County	1	Current TO 1000 PM	100 PM TO 900 PM
Denver County	1	Current TO 1000 PM	100 PM TO 900 PM
DIA	1	Current TO 1000 PM	100 PM TO 900 PM
Arapahoe County	1	Current TO 1000 PM	100 PM TO 900 PM
the City of Aurora	1	Current TO 1000 PM	100 PM TO 900 PM
Arvada	1	Current TO 1000 PM	100 PM TO 900 PM
Wheat Ridge	1	Current TO 1000 PM	100 PM TO 900 PM
Lakewood	1	Current TO 1000 PM	100 PM TO 900 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	1200 PM TO 1000 PM	0.1" (75%) to 0.3" (50%) to 0.9" (25%)	ISSUED
Arapahoe	1200 PM TO 1000 PM	0.1" (75%) to 0.3" (50%) to 0.9" (25%)	ISSUED
Boulder	1200 PM TO 1000 PM	0.1" (80%) to 0.3" (50%) to 0.9" (20%)	ISSUED
Broomfield	1200 PM TO 1000 PM	0.1" (80%) to 0.3" (50%) to 0.9" (20%)	ISSUED
Denver	1200 PM TO 1000 PM	0.1" (75%) to 0.3" (50%) to 0.9" (25%)	ISSUED
Douglas	1200 PM TO 1000 PM	0.1" (80%) to 0.3" (50%) to 0.9" (20%)	ISSUED
Jefferson	1200 PM TO 1000 PM	0.1" (80%) to 0.3" (50%) to 0.9" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM THU	0.1" (90%) to 0.3" (60%) to 0.9" (20%)	ISSUED
Douglas	Current TO 1000 PM THU	0.1" (90%) to 0.3" (60%) to 0.9" (20%)	ISSUED
Jefferson	Current TO 1000 PM THU	0.1" (90%) to 0.3" (60%) to 0.9" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.