Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid through 9:00 PM. Surface moisture has increased behind a cold front that moved through earlier today capping temperatures but enough daytime heating has occurred to result in isolated strong to severe thunderstorms. Best chances for thunderstorms into the evening will be over central and northern areas of the District.
-	Thunderstorms will move fairly quickly from WSW to ENE at 20-25mph helping to reduce point rainfall amounts from a single storm. Training of thunderstorm cells or a slower moving thunderstorm may result in a period of heavier rain that could lead to excessive runoff. Large hail and potentially some accumulating hail may occur under strong to severe thunderstorm cells.
-	Towards sunset as temperatures cool the threat for thunderstorms will end but isolated to widely scattered rain showers will continue possible overnight.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.1-0.3" in 10-30 minutes. Strong thunderstorms will have the potential to produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: Training of strong thunderstorms may produce up to 1.4" of rain 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" (95%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Arapahoe	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Boulder	Current TO 900 PM SAT	0.1" (95%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Broomfield	Current TO 900 PM SAT	0.1" (95%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Denver	Current TO 900 PM SAT	0.1" (85%) to 0.3" (45%) to 0.8" (15%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (75%) to 0.3" (40%) to 0.8" (10%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SAT	0.1" (80%) to 0.3" (50%) to 0.8" (10%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (70%) to 0.3" (40%) to 0.8" (10%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (80%) to 0.3" (50%) to 0.8" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.