Flash Flood Prediction Program

-	The Message 2 for Boulder County will remain in effect until 9:00 PM. Message 1's for all other Counties within the District will also remain valid until 9:00 PM.
-	Thunderstorms have initiated in and near the District with prime time through 8:00 PM. Typical storms are producing light to briefly moderate rain as the District has yet to experience a stronger storm. If the trend holds storms will continue to be weak to moderate in nature for most areas, however a strong thunderstorm cannot be ruled out which will be capable of producing heavy rainfall that may lead to excessive runoff.
-	Upper level steering winds are from SW to NE at around 15mph. One round of storms E of I-25 will clear the District in the next 60-90 minutes with another wave approaching from the SW keeping chances for storms into the evening.

STORM RAINFALL POTENTIAL AND DURATION: More typical weak to moderate thunderstorms will produce rainfall rates of 0.1-0.5" in 10-30 minutes. Strong thunderstorms will will have the potential to produce rainfall rates of 0.5-1.5" in 10-30 minutes.

WORST CASE SCENARIO: A large thunderstorm complex or a nearly stationary strong thunderstorm cell may result in up to 2.5" of rain in 60-90 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	2	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	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED
Arapahoe	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED
Boulder	Current TO 900 PM FRI	0.1" (80%) to 0.5" (40%) to 1.5" (5%)	ISSUED
Broomfield	Current TO 900 PM FRI	0.1" (80%) to 0.5" (40%) to 1.5" (5%)	ISSUED
Denver	Current TO 900 PM FRI	0.1" (80%) to 0.5" (40%) to 1.5" (5%)	ISSUED
Douglas	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED
Jefferson	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED
Douglas	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED
Jefferson	Current TO 900 PM FRI	0.1" (90%) to 0.5" (50%) to 1.5" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.