Flash Flood Prediction Program

-	Message 1's have been issued for the entire District until 10:00pm.
-	A gust front from the south is triggering thunderstorms across the District at this time. Storms are pulse-type in nature, but storms motions are slow and erratic which will result in a threat for heavy rainfall and excessive runoff.
-	Additional storms could be triggered across the District by outflow boundaries through the late afternoon hours and into the evening. The best chance of storms will continue into the early evening hours before activity gradually tapers off after sunset.

STORM RAINFALL POTENTIAL AND DURATION: Thunderstorms will be capable of producing rainfall of 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm stalls over an area and produces heavy rainfall of up to 1.7" in 60-90 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 1000 PM	Current TO 800 PM
Jefferson County	1	Current TO 1000 PM	Current TO 800 PM
Broomfield County	1	Current TO 1000 PM	Current TO 800 PM
Douglas County	1	Current TO 1000 PM	Current TO 800 PM
Adams County	1	Current TO 1000 PM	Current TO 800 PM
Denver County	1	Current TO 1000 PM	Current TO 800 PM
DIA	1	Current TO 1000 PM	Current TO 800 PM
Arapahoe County	1	Current TO 1000 PM	Current TO 800 PM
the City of Aurora	1	Current TO 1000 PM	Current TO 800 PM
Arvada	1	Current TO 1000 PM	Current TO 800 PM
Wheat Ridge	1	Current TO 1000 PM	Current TO 800 PM
Lakewood	1	Current TO 1000 PM	Current TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM SAT	0.1" (90%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Arapahoe	Current TO 1000 PM SAT	0.1" (95%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Boulder	Current TO 1000 PM SAT	0.1" (80%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Broomfield	Current TO 1000 PM SAT	0.1" (80%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Denver	Current TO 1000 PM SAT	0.1" (85%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Douglas	Current TO 1000 PM SAT	0.1" (95%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Jefferson	Current TO 1000 PM SAT	0.1" (85%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM SAT	0.1" (90%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Douglas	Current TO 1000 PM SAT	0.1" (90%) to 0.3" (50%) to 0.8" (20%)	ISSUED
Jefferson	Current TO 1000 PM SAT	0.1" (90%) to 0.3" (50%) to 0.8" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.