Flash Flood Prediction Program

Message 1’s will be allowed to expire at 8:00PM as the threat of heavy rain has come to an end.

A few showers and a weak thunderstorm or two will be possible over the next few hours as the tail end of today’s disturbance continues eastward. If any storms develop, they are expected to favor southern portions of the District through 10:00PM. Quick storm motions from west to east, between 25-35 mph will limit any point rainfall amounts.

Overnight lows will remain in the low to mid 60’s across most of the District.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace to 0.20” total, in 10-30 minutes. A weak thunderstorm could produce 0.20-0.40” total, in 10-30 minutes.

WORST CASE SCENARIO: A moderate to strong thunderstorm has the potential to produce up to 0.80” total, in 45-60 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 800 PM	Current TO 700 PM
Jefferson County	1	Current TO 800 PM	Current TO 700 PM
Broomfield County	1	Current TO 800 PM	Current TO 700 PM
Douglas County	1	Current TO 800 PM	Current TO 700 PM
Adams County	1	Current TO 800 PM	Current TO 700 PM
Denver County	1	Current TO 800 PM	Current TO 700 PM
DIA	1	Current TO 800 PM	Current TO 700 PM
Arapahoe County	1	Current TO 800 PM	Current TO 700 PM
the City of Aurora	1	Current TO 800 PM	Current TO 700 PM
Arvada	1	Current TO 800 PM	Current TO 700 PM
Wheat Ridge	1	Current TO 800 PM	Current TO 700 PM
Lakewood	1	Current TO 800 PM	Current TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM WED	Trace (35%) to 0.2" (15%) to 0.4" (5%)	NONE
Arapahoe	Current TO 1000 PM WED	Trace (40%) to 0.2" (25%) to 0.4" (10%)	NONE
Boulder	Current TO 1000 PM WED	Trace (35%) to 0.2" (15%) to 0.4" (5%)	NONE
Broomfield	Current TO 1000 PM WED	Trace (35%) to 0.2" (15%) to 0.4" (5%)	NONE
Denver	Current TO 1000 PM WED	Trace (35%) to 0.2" (15%) to 0.4" (5%)	NONE
Douglas	Current TO 1000 PM WED	Trace (40%) to 0.2" (25%) to 0.4" (10%)	NONE
Jefferson	Current TO 1000 PM WED	Trace (35%) to 0.2" (15%) to 0.4" (5%)	NONE
Foothills above 6500ft
Boulder	Current TO 1000 PM WED	Trace (40%) to 0.2" (25%) to 0.4" (10%)	NONE
Douglas	Current TO 1000 PM WED	Trace (40%) to 0.2" (25%) to 0.4" (10%)	NONE
Jefferson	Current TO 1000 PM WED	Trace (40%) to 0.2" (25%) to 0.4" (10%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.