Flash Flood Prediction Program

-	Message 1's have been issued for Douglas County and will be valid until 10pm this evening.
-	Moderate to strong thunderstorms have developed over Douglas County behind a gust front that originated south of the District. As this gust front moves northward additional thunderstorms may develop and additional Message 1's may need to be issued.
-	Strong thunderstorms will be capable of producing heavy rainfall, hail and gusty winds. Storm motions are very slow or nearly stationary and can lead to a prolonged period of heavy rain that may lead to excessive runoff.

STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in heavy rainfall of 0.40-1.40" in 15-45 minutes.

County	Message	Valid Times	Prime Time
Douglas County	1	Current TO 1000 PM	Current TO 900 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM SAT	0.1" (40%) to 0.3" (15%) to 0.8" (5%)	LOW
Arapahoe	Current TO 1000 PM SAT	0.1" (75%) to 0.3" (50%) to 0.8" (15%)	MOD
Boulder	Current TO 1000 PM SAT	0.1" (40%) to 0.3" (15%) to 0.8" (5%)	LOW
Broomfield	Current TO 1000 PM SAT	0.1" (40%) to 0.3" (15%) to 0.8" (5%)	LOW
Denver	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	LOW
Douglas	Current TO 1000 PM SAT	0.1" (95%) to 0.3" (75%) to 0.8" (30%)	ISSUED
Jefferson	Current TO 1000 PM SAT	0.1" (75%) to 0.3" (50%) to 0.8" (15%)	LOW
Foothills above 6500ft
Boulder	Current TO 1000 PM SAT	0.1" (40%) to 0.3" (15%) to 0.8" (5%)	LOW
Douglas	Current TO 1000 PM SAT	0.1" (100%) to 0.3" (80%) to 0.8" (40%)	ISSUED
Jefferson	Current TO 1000 PM SAT	0.1" (80%) to 0.3" (60%) to 0.8" (20%)	MOD

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.