Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 9pm this evening.
-	Modest surface moisture and a passing upper level disturbance will result in a round or two of showers and thunderstorms this afternoon and early evening over the District. Individual thunderstorms will be relatively fast moving from SW to NE at 20-25mph which will keep the majority of the moderate to heavy rainfall brief. The greatest threat for extended periods of heavy rainfall will be from "training" of multiple thunderstorm cells over a single location. Strong thunderstorms may also become severe with gusty winds and large hail being the primary threats.
-	Best chances for thunderstorm activity will be through about sunset with additional rain showers possible into the evening.

STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will produce 0.3-0.8" of rain in 10-30 minutes.

WORST CASE SCENARIO: Training of thunderstorm cells may result in up to 1.6" of rainfall in 30-60 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 900 PM	300 PM TO 800 PM
Jefferson County	1	Current TO 900 PM	300 PM TO 800 PM
Broomfield County	1	Current TO 900 PM	300 PM TO 800 PM
Douglas County	1	Current TO 900 PM	300 PM TO 800 PM
Adams County	1	Current TO 900 PM	300 PM TO 800 PM
Denver County	1	Current TO 900 PM	300 PM TO 800 PM
DIA	1	Current TO 900 PM	300 PM TO 800 PM
Arapahoe County	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
Lakewood	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 0.8" (30%)	ISSUED
Arapahoe	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Boulder	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Broomfield	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Denver	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (90%) to 0.3" (60%) to 0.8" (30%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.