Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9pm this evening.
-	Thunderstorm activity has developed over portions of the District early this afternoon. Most storms will produce light to moderate rain and small hail. Strong thunderstorm cells will have the potential to produce brief heavy rainfall, gusty winds and large hail.
-	Storms will move from WSW to ENE at around 25mph with strong thunderstorm cells potentially moving against the grain to the SE at a slower speed. Excessive runoff roadways and smaller creeks/streams will be the greatest threat areas for excessive runoff today.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak to moderate thunderstorms will produce a trace to 0.3" in 10-30 minutes. A strong thunderstorm will have the potential to produce 0.3-0.7" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving strong thunderstorm or training of moderate/strong thunderstorm cells may result in up to 1.4" of rain in 30-60 minutes.

County	Message	Valid Times	Prime Time
Arapahoe County	1	Current TO 900 PM	300 PM TO 800 PM
DIA	1	Current TO 900 PM	300 PM TO 800 PM
Denver County	1	Current TO 900 PM	300 PM TO 800 PM
Adams County	1	Current TO 900 PM	300 PM TO 800 PM
Douglas County	1	Current TO 900 PM	300 PM TO 800 PM
Broomfield County	1	Current TO 900 PM	300 PM TO 800 PM
Jefferson County	1	Current TO 900 PM	300 PM TO 800 PM
Boulder County	1	Current TO 900 PM	300 PM TO 800 PM
Lakewood	1	Current TO 900 PM	300 PM TO 800 PM
the City of Aurora	1	Current TO 900 PM	300 PM TO 800 PM
Arvada	1	Current TO 900 PM	300 PM TO 800 PM
Wheat Ridge	1	Current TO 900 PM	300 PM TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Arapahoe	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Boulder	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Broomfield	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Denver	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (15%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (15%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.7" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.