Flash Flood Prediction Program

Message 1's will continue to be valid until 10:00pm. Several rounds of storms have already moved through the District, but the threat of heavy rainfall remains in place through the evening. Storms have already affected Jefferson County to Downtown Denver and Northeast Adams County between 3:00-6:30pm and have left the District. Even with cooler temperatures, a slight chance of heavy rain remains in place for the District, as another round of storms will be possible this evening.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce a 0.25-0.75” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.75-1.25" total in 10-30 minutes.

WORST CASE SCENARIO: A strong, stationary thunderstorm, or training of thunderstorm cells will have the potential to produce up to 1.50-2.00” total in 30-60 minutes.

County	Message	Valid Times	Prime Time
Denver County	1	Current TO 1000 PM	Current TO 900 PM
Adams County	1	Current TO 1000 PM	Current TO 900 PM
Douglas County	1	Current TO 1000 PM	Current TO 900 PM
Broomfield County	1	Current TO 1000 PM	Current TO 900 PM
Jefferson County	1	Current TO 1000 PM	Current TO 900 PM
Boulder County	1	Current TO 1000 PM	Current TO 900 PM
DIA	1	Current TO 1000 PM	Current TO 900 PM
Arapahoe County	1	Current TO 1000 PM	Current TO 900 PM
the City of Aurora	1	Current TO 1000 PM	Current TO 900 PM
Arvada	1	Current TO 1000 PM	Current TO 900 PM
Wheat Ridge	1	Current TO 1000 PM	Current TO 900 PM
Lakewood	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 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Arapahoe	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Boulder	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Broomfield	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Denver	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Douglas	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Jefferson	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Douglas	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED
Jefferson	Current TO 900 PM THU	0.5" (75%) to 0.75" (50%) to 1.25" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.