Flash Flood Prediction Program

-	Message 1's have been issued and will be valid until 9:00pm this evening.
-	A few weak rain showers/isolated thunderstorms have impacted the District and will continue to move eastward at this time. A stronger line of storms to the W/NW is currently moving towards the District and will have the best chance at producing moderate to heavy rainfall as it moves through the District. Slow moving or stationary thunderstorm that develop along any gust fronts may move very slowly or remain stationary having the potential for heavy rainfall. Strong thunderstorms may also contain gusty winds, hail and frequent cloud-to-ground lightning.
-	Prime time for storms in the District will be between 3-8pm with one or two rounds of thunderstorms possible. Upper-level winds should carry most storms from W to E between 10-15mph, however, gust fronts could anchor storms or cause erratic motions at times.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce 0.1-0.4" in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.0" in 10-30 minutes.

WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in up to 1.8" of rain in 60-90 minutes.

County	Message	Valid Times	Prime Time
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
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" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Arapahoe	Current TO 900 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Boulder	Current TO 900 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Broomfield	Current TO 900 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Denver	Current TO 900 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.4" (60%) to 1.0" (20%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.4" (60%) to 1.0" (20%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.4" (60%) to 1.0" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.