Flash Flood Prediction Program

-	A cold front is moving into the region form the north this morning with rain showers and weak thunderstorms forming along the front at this time. Currently dew points are in the low 50's in the District, combined with sufficient mid to upper-level moisture will bring a good chance for heavy rainfall, even out of weak to moderate rain showers. moderate to strong thunderstorms will be very capable of producing heavy rainfall that may lead to excessive runoff and possibly flash flooding.
-	Individual thunderstorms will be relatively fast moving from N/NW to S/SE at 10-20mph helping limit point rainfall amounts from a single storm. Outflow boundaries from thunderstorms this afternoon may be a focus for stronger storms with the potential to produce extended periods of heavy rainfall. Training of thunderstorm cells could also be a culprit for linger duration heavy rainfall especially areas along the foothills. Prime time for thunderstorms is from roughly 11am to 9pm with a slight chance for lingering showers after 9pm.
-	After 10pm, skies will gradually clear through the overnight with low dropping into the upper 50's to low 60's on the plains with low to mid 50's for the foothills.

STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will have the potential to produce 0.3-0.9" 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 1.8" in 45-75 minutes.

County	Message	Valid Times	Prime Time
Lakewood	1	Current TO 900 PM	1100 AM TO 800 PM
the City of Aurora	1	Current TO 900 PM	1100 AM TO 800 PM
Arvada	1	Current TO 900 PM	1100 AM TO 800 PM
Wheat Ridge	1	Current TO 900 PM	1100 AM TO 800 PM
DIA	1	Current TO 900 PM	1100 AM TO 800 PM
Arapahoe County	1	Current TO 900 PM	1100 AM TO 800 PM
Denver County	1	Current TO 900 PM	1100 AM TO 800 PM
Adams County	1	Current TO 900 PM	1100 AM TO 800 PM
Douglas County	1	Current TO 900 PM	1100 AM TO 800 PM
Jefferson County	1	Current TO 900 PM	1100 AM TO 800 PM
Broomfield County	1	Current TO 900 PM	1100 AM TO 800 PM
Boulder County	1	Current TO 900 PM	1100 AM TO 800 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" (45%) to 0.9" (20%)	ISSUED
Arapahoe	Current TO 900 PM SAT	0.1" (90%) to 0.3" (45%) to 0.9" (20%)	ISSUED
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.9" (25%)	ISSUED
Broomfield	Current TO 900 PM SAT	0.1" (90%) to 0.3" (45%) to 0.9" (20%)	ISSUED
Denver	Current TO 900 PM SAT	0.1" (90%) to 0.3" (45%) to 0.9" (20%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.9" (25%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (50%) to 0.9" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.9" (30%)	ISSUED
Douglas	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.9" (30%)	ISSUED
Jefferson	Current TO 900 PM SAT	0.1" (90%) to 0.3" (60%) to 0.9" (30%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.