Flash Flood Prediction Program

-	Upper-level high pressure remains the dominant feature across the West Tuesday, with NW flow aloft over Colorado. Afternoon temperatures will climb further above average today, topping out in the low 80s over the plains.
-	Enough moisture remains underneath the ridge to help produce isolated showers and thunderstorms this afternoon and evening. Today's storms will be high-based and generally weak, producing little rainfall over the District. Gusty outflow winds and lightning are the greatest hazards from these storms.
-	Convection will be most numerous over the foothills, Cheyenne Ridge, and Palmer Divide, where greater instability exists. Today's storms will track to the SE at around 15-20mph, with the best chance for a storm over the District occurring between about 3pm-8pm.

STORM RAINFALL POTENTIAL AND DURATION: Showers and thunderstorms will produce rainfall amounts of Trace-0.20" in 10-30 minutes.

WORST CASE SCENARIO: An isolated stronger thunderstorm or training of storm cells over the same area results in rainfall of 0.20-0.50" in 60-90 minutes.

A LOOK AHEAD: High pressure moves overhead Wednesday, pushing temperatures into the low to mid 80s. Residual moisture will maintain a slight chance for isolated, high-based storms once again, most numerous over the higher terrain.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	300 PM TO 800 PM	Trace (60%) to 0.1" (40%) to 0.2" (10%)	NONE
Arapahoe	300 PM TO 800 PM	Trace (60%) to 0.1" (40%) to 0.2" (10%)	NONE
Boulder	300 PM TO 800 PM	Trace (70%) to 0.1" (50%) to 0.2" (15%)	NONE
Broomfield	300 PM TO 800 PM	Trace (60%) to 0.1" (40%) to 0.2" (10%)	NONE
Denver	300 PM TO 800 PM	Trace (60%) to 0.1" (40%) to 0.2" (10%)	NONE
Douglas	300 PM TO 800 PM	Trace (70%) to 0.1" (50%) to 0.2" (15%)	NONE
Jefferson	300 PM TO 800 PM	Trace (70%) to 0.1" (50%) to 0.2" (15%)	NONE
Foothills above 6500ft
Boulder	200 PM TO 800 PM	Trace (70%) to 0.1" (50%) to 0.2" (20%)	NONE
Douglas	200 PM TO 800 PM	Trace (70%) to 0.1" (50%) to 0.2" (20%)	NONE
Jefferson	200 PM TO 800 PM	Trace (70%) to 0.1" (50%) to 0.2" (20%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.