Flash Flood Prediction Program

-	Message 1's will continue valid for the entire District through 10pm this evening although the threat for heavy rainfall is lowering.
-	An initial thunderstorm over Jefferson County early this afternoon produced cloud cover over the District keeping temperatures lower than surrounding locations and has resulted in a lack of storms so far today as the air has remained rather stable. Additional daytime heating or outflow from thunderstorms to the S and N of the District may be able to initiate new thunderstorms over the coming hours that would be capable of heavy rainfall as ample surface moisture remains in place.
-	Around sunset the threat for thunderstorms will diminish and Messages will most likely be allowed to expire this evening.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.1-0.3" of rain 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 thunderstorm cells or a large/slower moving thunderstorm may result in up to 1.6" of rain in 45-60 minutes.

County	Message	Valid Times	Prime Time
Douglas County	1	Current TO 1000 PM	100 PM TO 900 PM
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
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	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Arapahoe	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Boulder	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Broomfield	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Denver	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Douglas	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Jefferson	Current TO 1000 PM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM SAT	0.1" (75%) to 0.3" (40%) to 0.8" (10%)	ISSUED
Douglas	Current TO 1000 PM SAT	0.1" (75%) to 0.3" (40%) to 0.8" (10%)	ISSUED
Jefferson	Current TO 1000 PM SAT	0.1" (75%) to 0.3" (40%) to 0.8" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.