Flash Flood Prediction Program

-	Flow aloft turns more southwesterly over Colorado throughout the day, ahead of a Pacific trough of low pressure digging into the Northern Rockies. Afternoon temperatures will rebound back to around 90, with plenty of sunshine expected this morning.
-	Showers and thunderstorms will fire over the mountains and higher foothills by early afternoon, eventually tracking ENE onto the adjacent plains during the late afternoon and early evening. Today’s storms are not expected to be as strong or widespread as Wednesday’s, but with elevated moisture still in place and weak steering flow, stronger storm cells may produce locally-heavy rainfall.
-	Storms today will track to the ENE at around 10-20mph, with the best chance for a storm over the District occurring between about 3:00pm-8:00pm.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate showers and thunderstorms will produce rainfall between 0.05-0.20" in 10-30 minutes. Stronger storm cells may produce rainfall between 0.20-0.60" in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving, strong-to-severe thunderstorm produces rainfall up to 2.00" in 60-90 minutes.

A LOOK AHEAD: A similar day is expected for Friday, with afternoon temperatures holding around 90, while a passing shortwave disturbance helps trigger isolated to widely-scattered showers and thunderstorms over the foothills and plains.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	300 PM TO 800 PM	0.1" (80%) to 0.3" (50%) to 0.6" (15%)	LOW
Arapahoe	300 PM TO 800 PM	0.1" (85%) to 0.3" (55%) to 0.6" (25%)	LOW
Boulder	300 PM TO 800 PM	0.1" (70%) to 0.3" (40%) to 0.6" (10%)	LOW
Broomfield	300 PM TO 800 PM	0.1" (70%) to 0.3" (40%) to 0.6" (10%)	LOW
Denver	300 PM TO 800 PM	0.1" (75%) to 0.3" (45%) to 0.6" (15%)	LOW
Jefferson	300 PM TO 800 PM	0.1" (75%) to 0.3" (45%) to 0.6" (15%)	LOW
Douglas	200 PM TO 800 PM	0.1" (85%) to 0.3" (55%) to 0.6" (25%)	LOW
Foothills above 6500ft
Boulder	200 PM TO 800 PM	0.1" (80%) to 0.3" (50%) to 0.6" (15%)	LOW
Douglas	200 PM TO 800 PM	0.1" (90%) to 0.3" (65%) to 0.6" (35%)	LOW
Jefferson	200 PM TO 800 PM	0.1" (85%) to 0.3" (60%) to 0.6" (30%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.