Flash Flood Prediction Program

-	The summer monsoon continues to advect Pacific moisture into the state, creating conditions for slow-moving afternoon to evening showers and thunderstorms. High temperatures will reach the upper 80's to low 90's, with dew points in the mid to upper 40's.
-	Convection will begin across the foothills around noon, moving northeast at 10-15 mph. The highest QPF amounts are anticipated across the foothills and Palmer Divide, with isolated to scattered thunderstorms expected along the Front Range Urban Corridor. Stronger storms descending the foothills will have the potential to produce brief moderate to heavy rain, hail, and gusty outflow boundaries.
-	Storms will propagate out of the District by 10PM, with a slight chance for an isolated shower through 2AM.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce rainfall rates of TR-0.2". Moderate to strong thunderstorms may produce rainfall rates of 0.1"-0.5" in 10 to 30 minutes.

WORST CASE SCENARIO: Anchoring or slow-moving strong storms may produce rainfall rates of 0.4"-1.0" in 10-30 minutes, and up to 1.6" in 45-75 minutes.

A LOOK AHEAD: Tomorrow will have a high potential for severe storms as a frontal boundary approaches from the north. High temperatures will reach the upper 80's with dew points in the mid to upper 50's, creating favorable conditions for heavy rainfall-producing thunderstorms. Excessive runoff and flooding is possible across the District.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Arapahoe	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Boulder	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Broomfield	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Denver	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Douglas	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Jefferson	100 PM TO 900 PM	Trace (80%) to 0.2" (40%) to 0.5" (10%)	LOW
Foothills above 6500ft
Boulder	1200 PM TO 1000 PM	Trace (90%) to 0.2" (50%) to 0.5" (20%)	LOW
Douglas	1200 PM TO 1000 PM	Trace (90%) to 0.2" (50%) to 0.5" (20%)	LOW
Jefferson	1200 PM TO 1000 PM	Trace (90%) to 0.2" (50%) to 0.5" (20%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.