Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid from Noon to 9:00 PM.
-	Showers and thunderstorms will be on the increase through the early afternoon with multiple rounds of storms moving through into the early evening. Thunderstorms that develop today will be very capable of producing heavy rainfall that may lead to excessive runoff and possibly flash flooding. Strong thunderstorms may also produce large hail and gusty straight-line winds in excess of 50mph.
-	Best chances for thunderstorm activity will be from 1-9pm. Strongest storms will likely favor the plains versus the foothills. Storm motions will generally be from W to E at around 15mph but stronger storms may move more erratically.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.1-0.6" in 10-30 minutes. Strong thunderstorms will produce 0.6-1.4" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving large thunderstorm or training of thunderstorm cells may result in up to 3.0" in 90 minutes or less.

County	Message	Valid Times	Prime Time
the City of Aurora	1	1200 PM TO 900 PM	100 PM TO 800 PM
Arapahoe County	1	1200 PM TO 900 PM	100 PM TO 800 PM
DIA	1	1200 PM TO 900 PM	100 PM TO 800 PM
Denver County	1	1200 PM TO 900 PM	100 PM TO 800 PM
Adams County	1	1200 PM TO 900 PM	100 PM TO 800 PM
Douglas County	1	1200 PM TO 900 PM	100 PM TO 800 PM
Broomfield County	1	1200 PM TO 900 PM	100 PM TO 800 PM
Jefferson County	1	1200 PM TO 900 PM	100 PM TO 800 PM
Boulder County	1	1200 PM TO 900 PM	100 PM TO 800 PM
Arvada	1	1200 PM TO 900 PM	100 PM TO 800 PM
Wheat Ridge	1	1200 PM TO 900 PM	100 PM TO 800 PM
Lakewood	1	1200 PM TO 900 PM	100 PM TO 800 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Arapahoe	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Boulder	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Broomfield	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Denver	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Douglas	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Jefferson	1230 PM TO 900 PM	0.1" (95%) to 0.6" (60%) to 1.4" (30%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM THU	0.1" (95%) to 0.6" (60%) to 1.4" (25%)	ISSUED
Douglas	Current TO 900 PM THU	0.1" (95%) to 0.6" (60%) to 1.4" (25%)	ISSUED
Jefferson	Current TO 900 PM THU	0.1" (95%) to 0.6" (60%) to 1.4" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.