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 have already initiated over the higher terrain of Boulder County. Thunderstorm activity will spread eastward as the day progresses with 1-3 rounds of showers and thunderstorms into the early evening.
-	There is a surface wind convergence line that has developed over the central portion of the District with moist air north of it and drier air south. Thunderstorms will likely develop along this convergence line and with ample shear some storms may become strong to severe producing brief heavy rainfall, gusty winds and hail.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak to moderate thunderstorms will produce a trace to 0.3". Strong thunderstorms will have the potential to produce up to 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving strong thunderstorm or training of strong thunderstorm cells may result in up to 1.4" in 45-60 minutes.

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	100 PM TO 900 PM	0.1" (90%) to 0.3" (60%) to 0.8" (25%)	ISSUED
Arapahoe	100 PM TO 900 PM	0.1" (85%) to 0.3" (55%) to 0.8" (15%)	ISSUED
Boulder	100 PM TO 900 PM	0.1" (90%) to 0.3" (60%) to 0.8" (25%)	ISSUED
Broomfield	100 PM TO 900 PM	0.1" (90%) to 0.3" (60%) to 0.8" (25%)	ISSUED
Denver	100 PM TO 900 PM	0.1" (90%) to 0.3" (60%) to 0.8" (25%)	ISSUED
Douglas	100 PM TO 900 PM	0.1" (80%) to 0.3" (50%) to 0.8" (10%)	ISSUED
Jefferson	100 PM TO 900 PM	0.1" (90%) to 0.3" (60%) to 0.8" (25%)	ISSUED
Foothills above 6500ft
Douglas	100 PM TO 900 PM	0.1" (80%) to 0.3" (50%) to 0.8" (10%)	ISSUED
Jefferson	100 PM TO 900 PM	0.1" (95%) to 0.3" (60%) to 0.8" (20%)	ISSUED
Boulder	Current TO 900 PM FRI	0.1" (100%) to 0.3" (60%) to 0.8" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.