Flash Flood Prediction Program

-	Observations Friday morning show plenty of cloud cover along the Front Range, ahead of an upper-level trough currently tracking through the Northern Rockies. Afternoon highs will be slightly cooler today, topping out in the mid to upper 80s under partly-cloudy skies.
-	The passing trough to our N will help focus shower and thunderstorm activity this afternoon and evening. Storms are expected to fire early this afternoon over the mountains and foothills, and strengthen as they propagate E onto the plains and encounter better surface moisture and instability.
-	Most storms over the District today should remain high-based, and only produce light to briefly-moderate rainfall totals and gusty winds. Although unlikely, the slight chance exists for a stronger storm to produce locally-heavy rainfall, given the elevated moisture levels and convective energy lurking to our E.

STORM RAINFALL POTENTIAL AND DURATION: Showers and thunderstorms today will track to the ENE at around 12-18mph, and produce rainfall amounts between Trace-0.20" in 10-30 minutes. The prime period for a storm over the District is between about 2:00pm-6:00pm.

WORST CASE SCENARIO: Moist outflow from adjacent storm activity pushes into the District, allowing a strong to severe thunderstorm to produce rainfall up to 1.50" in 60-90 minutes.

A LOOK AHEAD: Much drier air arrives this weekend under flat northwesterly flow aloft, giving us a break from diurnal shower and thunderstorm activity. Afternoon temperatures climb back into the low to mid 90s Saturday, with mid to upper 90s possible on Sunday.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	200 PM TO 600 PM	Trace (80%) to 0.2" (55%) to 0.5" (15%)	LOW
Arapahoe	200 PM TO 600 PM	Trace (80%) to 0.2" (55%) to 0.5" (15%)	LOW
Boulder	200 PM TO 600 PM	Trace (70%) to 0.2" (45%) to 0.5" (5%)	LOW
Broomfield	200 PM TO 600 PM	Trace (70%) to 0.2" (45%) to 0.5" (5%)	LOW
Denver	200 PM TO 600 PM	Trace (75%) to 0.2" (50%) to 0.5" (5%)	LOW
Douglas	200 PM TO 600 PM	Trace (80%) to 0.2" (55%) to 0.5" (15%)	LOW
Jefferson	200 PM TO 600 PM	Trace (70%) to 0.2" (45%) to 0.5" (5%)	LOW
Foothills above 6500ft
Boulder	100 PM TO 600 PM	Trace (80%) to 0.2" (55%) to 0.5" (5%)	LOW
Douglas	100 PM TO 600 PM	Trace (80%) to 0.2" (55%) to 0.5" (5%)	LOW
Jefferson	100 PM TO 600 PM	Trace (80%) to 0.2" (55%) to 0.5" (5%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.