Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9:00 PM this evening.
-	Thunderstorms are currently starting to initiate over the District at this time. Slow storm motions and modest surface moisture will result in stronger storms capable of producing heavy rainfall which may lead to excessive runoff and potentially flash flooding.
-	Storms will move very slowly to the SE at 10mph or less. Stronger storms may become anchored and result in a prolonged period of heavy rainfall. Strong thunderstorms may also produce large hail.

STORM RAINFALL POTENTIAL AND DURATION: Thunderstorms will be capable of producing rainfall of 0.3-0.9" in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving thunderstorm or training of thunderstorm cells results in heavy rainfall of up to 2.0" in 60-90 minutes.

County	Message	Valid Times	Prime Time
Adams County	1	Current TO 900 PM	330 PM TO 800 PM
Broomfield County	1	Current TO 900 PM	330 PM TO 800 PM
Douglas County	1	Current TO 900 PM	330 PM TO 800 PM
Jefferson County	1	Current TO 900 PM	330 PM TO 800 PM
Boulder County	1	Current TO 900 PM	330 PM TO 800 PM
DIA	1	Current TO 900 PM	330 PM TO 800 PM
Denver County	1	Current TO 900 PM	330 PM TO 800 PM
Arapahoe County	1	Current TO 900 PM	330 PM TO 800 PM
the City of Aurora	1	Current TO 900 PM	330 PM TO 800 PM
Arvada	1	Current TO 900 PM	330 PM TO 800 PM
Wheat Ridge	1	Current TO 900 PM	330 PM TO 800 PM
Lakewood	1	Current TO 900 PM	330 PM 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" (80%) to 0.4" (50%) to 0.9" (20%)	ISSUED
Arapahoe	Current TO 900 PM SAT	0.1" (90%) to 0.4" (60%) to 0.9" (30%)	ISSUED
Boulder	Current TO 900 PM SAT	0.1" (80%) to 0.4" (50%) to 0.9" (20%)	ISSUED
Broomfield	Current TO 900 PM SAT	0.1" (80%) to 0.4" (50%) to 0.9" (20%)	ISSUED
Denver	Current TO 900 PM SAT	0.1" (90%) to 0.4" (60%) to 0.9" (30%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (95%) to 0.4" (60%) to 0.9" (30%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (85%) to 0.4" (55%) to 0.9" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SAT	0.1" (80%) to 0.4" (50%) to 0.9" (20%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (95%) to 0.4" (60%) to 0.9" (30%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (85%) to 55.0" (50%) to 0.9" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.