Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9:30 PM.
-	Slow storm motions and high moisture values at the surface and aloft will result in thunderstorms that develop this afternoon and evening having the potential to produce heavy rainfall that may result in excessive runoff and possibly flash flooding.
-	Cloud cover this morning may keep the stronger storms at bay but even weak to moderate storms will produce brief heavy rainfall should they develop. Best chances for thunderstorms will be from 3:30pm to 8:30pm, likely favoring the W and S areas of the District.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will only produce a trace to 0.2" of rainfall in 10-30 minutes. Thunderstorms will have the potential to produce rainfall rates of 0.4-1.0" in 10-30 minutes.

WORST CASE SCENARIO: A strong slower moving thunderstorm or anchored thunderstorm may result in up to 2.0" of heavy rain in 45-60 minutes.

County	Message	Valid Times	Prime Time
Arvada	1	Current TO 930 PM	330 PM TO 830 PM
the City of Aurora	1	Current TO 930 PM	330 PM TO 830 PM
Arapahoe County	1	Current TO 930 PM	330 PM TO 830 PM
DIA	1	Current TO 930 PM	330 PM TO 830 PM
Denver County	1	Current TO 930 PM	330 PM TO 830 PM
Douglas County	1	Current TO 930 PM	330 PM TO 830 PM
Adams County	1	Current TO 930 PM	330 PM TO 830 PM
Broomfield County	1	Current TO 930 PM	330 PM TO 830 PM
Jefferson County	1	Current TO 930 PM	330 PM TO 830 PM
Boulder County	1	Current TO 930 PM	330 PM TO 830 PM
Wheat Ridge	1	Current TO 930 PM	330 PM TO 830 PM
Lakewood	1	Current TO 930 PM	330 PM TO 830 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 930 PM SAT	0.1" (70%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Arapahoe	Current TO 930 PM SAT	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Boulder	Current TO 930 PM SAT	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Broomfield	Current TO 930 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Denver	Current TO 930 PM SAT	0.1" (75%) to 0.4" (50%) to 1.0" (15%)	ISSUED
Douglas	Current TO 930 PM SAT	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Jefferson	Current TO 930 PM SAT	0.1" (80%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 930 PM SAT	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED
Douglas	Current TO 930 PM SAT	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED
Jefferson	Current TO 930 PM SAT	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.