Flash Flood Prediction Program

-	Message 1's have been issued for the remaining areas of the District and will be valid until 9:00pm. A convergence line currently stretches from Jefferson County through the central portions of the District and is expected to act as a focus for additional thunderstorm development into this evening.
-	Thunderstorms that develop will have the potential to produce brief heavy rainfall that may lead to excessive runoff and street flooding. Hail and gusty winds may also accompany the stronger thunderstorm cells. Best chances for thunderstorm activity is expected to be through sunset.
-	Storm motions will generally be from west to east at 15-20mph. Stronger thunderstorms may anchor briefly or have erratic storm movements at times due to outflow boundaries/gust fronts.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak thunderstorms will produce a 0.1-0.3" of rain. Moderate to strong thunderstorms will have the potential to produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A stalled out thunderstorm along an outflow boundary may result in up to 1.6" of rain in 60 minutes or less.

County	Message	Valid Times	Prime Time
the City of Aurora	1	Current TO 900 PM	Current TO 830 PM
Arapahoe County	1	Current TO 900 PM	Current TO 830 PM
DIA	1	Current TO 900 PM	Current TO 830 PM
Denver County	1	Current TO 900 PM	Current TO 830 PM
Adams County	1	Current TO 900 PM	Current TO 830 PM
Douglas County	1	Current TO 900 PM	Current TO 830 PM
Broomfield County	1	Current TO 900 PM	Current TO 830 PM
Jefferson County	1	Current TO 900 PM	Current TO 830 PM
Boulder County	1	Current TO 900 PM	Current TO 830 PM
Lakewood	1	Current TO 900 PM	Current TO 830 PM
Arvada	1	Current TO 900 PM	Current TO 830 PM
Wheat Ridge	1	Current TO 900 PM	Current TO 830 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Arapahoe	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Broomfield	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Denver	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.8" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.