Flash Flood Prediction Program

-	Message 1's will continue valid although the threat for heavy rainfall is diminishing now that temperatures are cooling.
-	Strong/slow moving thunderstorms concentrated just S and W of the District over Clear Creek County earlier this afternoon and more recently over SE Douglas County. Currently there is a gust front travelling northward from the Douglas County storms but is failing to initiate new thunderstorms with temperatures now in the 80's.
-	There is weak thunderstorm activity to the NW of the District at this time and should these storms survive their journey E/SE into the District or interact with the boundary moving northward heavy rainfall may still occur in areas that have had minimal storm activity up to this point. However, with the cooling temperatures thunderstorms will likely not be as strong as earlier in the day but it will not necessarily require a strong thunderstorm to produce brief heavy rainfall.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.1-0.5" in 10-30 minutes. Strong thunderstorms have the potential to produce 0.5-1.5" of heavy rain in 10-30 minutes.

WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in up to 2.5" in 60 minutes or less.

County	Message	Valid Times	Prime Time
Boulder County	1	100 PM TO 1000 PM	Current TO 900 PM
Jefferson County	1	100 PM TO 1000 PM	Current TO 900 PM
Broomfield County	1	100 PM TO 1000 PM	Current TO 900 PM
Douglas County	1	100 PM TO 1000 PM	Current TO 900 PM
Adams County	1	100 PM TO 1000 PM	Current TO 900 PM
Denver County	1	100 PM TO 1000 PM	Current TO 900 PM
DIA	1	100 PM TO 1000 PM	Current TO 900 PM
Arapahoe County	1	100 PM TO 1000 PM	Current TO 900 PM
the City of Aurora	1	100 PM TO 1000 PM	Current TO 900 PM
Arvada	1	100 PM TO 1000 PM	Current TO 900 PM
Wheat Ridge	1	100 PM TO 1000 PM	Current TO 900 PM
Lakewood	1	100 PM 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 1000 PM WED	0.1" (40%) to 0.5" (20%) to 1.5" (10%)	ISSUED
Arapahoe	Current TO 1000 PM WED	0.1" (80%) to 0.5" (50%) to 1.5" (20%)	ISSUED
Boulder	Current TO 1000 PM WED	0.1" (75%) to 0.5" (50%) to 1.5" (20%)	ISSUED
Broomfield	Current TO 1000 PM WED	0.1" (60%) to 0.5" (30%) to 1.5" (15%)	ISSUED
Denver	Current TO 1000 PM WED	0.1" (40%) to 0.5" (20%) to 1.5" (10%)	ISSUED
Douglas	Current TO 1000 PM WED	0.1" (80%) to 0.5" (50%) to 1.5" (20%)	ISSUED
Jefferson	Current TO 1000 PM WED	0.1" (75%) to 0.5" (50%) to 1.5" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM WED	0.1" (80%) to 0.5" (40%) to 1.5" (20%)	ISSUED
Douglas	Current TO 1000 PM WED	0.1" (80%) to 0.5" (40%) to 1.5" (20%)	ISSUED
Jefferson	Current TO 1000 PM WED	0.1" (80%) to 0.5" (40%) to 1.5" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.