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 lingering light, to briefly moderate rain showers continue to impact portions of the District currently, however the threat of heavy rainfall has ended for the evening. The best chance for continued light shower activity will be from now through midnight, with the best chance for precipitation along the foothills through the rest of the evening. A slight chance for a few lingering off and on rain showers through daybreak tomorrow, with minimal additional rainfall expected at this time.

Overnight lows will drop to around 50 degrees, with mid to upper 40’s along the foothills. The chance for rains showers continues tomorrow, with isolated thunderstorms in the afternoon, although the threat for heavy rainfall will be minimal at best.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce a trace to 0.1” in 10-30 minutes. A moderate rain shower could produce 0.1-0.3” in 10-30 minutes.

WORST CASE SCENARIO: A slower moving rain shower, isolated thunderstorm, or training of rain showers could potentially produce 0.3-0.8” in under 60 minutes.

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

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Arapahoe	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Boulder	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Broomfield	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Denver	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Douglas	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Jefferson	Current TO 200 AM FRI	Trace (60%) to 0.1" (30%) to 0.3" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 200 AM FRI	Trace (80%) to 0.1" (40%) to 0.3" (20%)	ISSUED
Douglas	Current TO 200 AM FRI	Trace (80%) to 0.1" (40%) to 0.3" (20%)	ISSUED
Jefferson	Current TO 200 AM FRI	Trace (80%) to 0.1" (40%) to 0.3" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.