Flash Flood Prediction Program

Message 1’s will be allowed to expire at 9:00 PM as the threat of heavy rainfall has come to an end.

A few strong thunderstorms impacted the Denver Metro earlier this afternoon and have since moved out of the District. Some lingering showers persist for areas surrounding the District at this time and will likely remain north and east of the District into the evening hours. Any remaining showers will continue to move eastward and away from the District.

There will be a slight chance for another round of showers and possibly a weak thunderstorm or two later this evening, favoring eastern portions of the District at this time. The best chance for additional showers will be between 9pm-11pm with skies partially clearing through the overnight.

Overnight temperatures will drop into the mid 60s for the plains with upper 50s to low 60s along the foothills. Partly cloudy sky conditions are expected overnight and through daybreak tomorrow. Tomorrow will bring another chance for moderate to heavy rainfall with a few rounds of storms possible in the afternoon and early evening with the potential for a few showers to linger into the late evening hours.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace to 0.20" total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.20-0.40" total in 10-30 minutes.

WORST CASE SCENARIO: A stationary, strong thunderstorm will have the potential to produce 0.40-0.80" total in 30-60 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 900 PM	Current TO 800 PM
Jefferson County	1	Current TO 900 PM	Current TO 800 PM
Broomfield County	1	Current TO 900 PM	Current TO 800 PM
Douglas County	1	Current TO 900 PM	Current TO 800 PM
Adams County	1	Current TO 900 PM	Current TO 800 PM
Denver County	1	Current TO 900 PM	Current TO 800 PM
DIA	1	Current TO 900 PM	Current TO 800 PM
Arapahoe County	1	Current TO 900 PM	Current TO 800 PM
the City of Aurora	1	Current TO 900 PM	Current TO 800 PM
Arvada	1	Current TO 900 PM	Current TO 800 PM
Wheat Ridge	1	Current TO 900 PM	Current TO 800 PM
Lakewood	1	Current TO 900 PM	Current TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1159 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Arapahoe	Current TO 1159 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Boulder	Current TO 1159 PM WED	Trace (20%) to 0.2" (10%) to 0.4" (5%)	ISSUED
Broomfield	Current TO 1159 PM WED	Trace (20%) to 0.2" (10%) to 0.4" (5%)	ISSUED
Denver	Current TO 1159 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Douglas	Current TO 1159 PM WED	Trace (40%) to 0.2" (20%) to 0.4" (10%)	ISSUED
Jefferson	Current TO 1159 PM WED	Trace (20%) to 0.2" (10%) to 0.4" (5%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1159 PM WED	Trace (20%) to 0.2" (10%) to 0.4" (5%)	ISSUED
Douglas	Current TO 1159 PM WED	Trace (20%) to 0.2" (10%) to 0.4" (5%)	ISSUED
Jefferson	Current TO 1159 PM WED	Trace (20%) to 0.2" (10%) to 0.4" (5%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.