Flash Flood Prediction Program

-	Message 1's will continue valid until 8:00pm this evening as another round of thunderstorms is possible over the District and may contain heavy rainfall.
-	Behind the first round of thunderstorms that moved through the District there is a lull expected over the next couple hours with another round possible between 5-7pm. If temperatures recover back into the upper 80s over the coming hours this second round of storms may become strong with the potential for brief heavy rainfall. If temperatures do not recover well then additional thunderstorms this afternoon may trend on the weaker side.
-	Strong thunderstorms that develop today may also become severe with gusty winds in excess of 50mph and large hail of 1" or more in diameter being the primary threats.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will have the potential to produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A large, slower moving thunderstorm or training of thunderstorm cells will have the potential to produce up to 1.5" of rain in 45-60 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	1200 PM TO 800 PM	400 PM TO 700 PM
Jefferson County	1	1200 PM TO 800 PM	400 PM TO 700 PM
Broomfield County	1	1200 PM TO 800 PM	400 PM TO 700 PM
Douglas County	1	1200 PM TO 800 PM	400 PM TO 700 PM
Adams County	1	1200 PM TO 800 PM	400 PM TO 700 PM
Denver County	1	1200 PM TO 800 PM	400 PM TO 700 PM
DIA	1	1200 PM TO 800 PM	400 PM TO 700 PM
Arapahoe County	1	1200 PM TO 800 PM	400 PM TO 700 PM
the City of Aurora	1	1200 PM TO 800 PM	400 PM TO 700 PM
Arvada	1	1200 PM TO 800 PM	400 PM TO 700 PM
Wheat Ridge	1	1200 PM TO 800 PM	400 PM TO 700 PM
Lakewood	1	1200 PM TO 800 PM	400 PM TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Arapahoe	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Boulder	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Broomfield	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Denver	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Douglas	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Jefferson	400 PM TO 800 PM	0.1" (60%) to 0.3" (30%) to 0.8" (15%)	ISSUED
Foothills above 6500ft
Boulder	400 PM TO 800 PM	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED
Douglas	400 PM TO 800 PM	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED
Jefferson	400 PM TO 800 PM	0.1" (80%) to 0.3" (40%) to 0.8" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.