Flash Flood Prediction Program

-	Another wave of scattered to widespread afternoon showers and thunderstorms today as high temperatures reach the upper 80's to around 90 degrees. Dewpoints will be in the upper 40's to low 50's; slightly lower than yesterday. Convection will begin across higher terrain around noon.
-	Storms are expected to descend the foothills during the early afternoon hours. Storm motions will be east at 15-20 MPH. Weak to moderate thunderstorms will favor areas across the foothills and east of I-25. There is a slight chance for a stronger thunderstorm or two capable or producing brief heavy rainfall, hail, and gusty winds.
-	Prime time for thunderstorm activity is from 1-8pm with additional light rain showers possible into the evening. Storm motions will shift to west-northwesterly around sunset with meaningful activity dissipating across the District before midnight.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a TR-0.3" of rain. Moderate to briefly strong thunderstorms will have the potential to produce rainfall rates of 0.3-0.9" in 10-30 minutes.

WORST CASE SCENARIO: Storms anchored to the foothills or surface boundary could produce rainfall rates of 0.5-1.2" in 10-30 minutes and up to 2.2" in 45-75 minutes.

A LOOK AHEAD: A retrograding ridge will begin expanding across the intermountain west on Friday. High temperatures will reach the low to mid 90's with a slight chance for weak afternoon showers and thunderstorms. 500mb heights may reach 600dm this weekend, producing daily highs in the mid to upper 90's. Some areas across the District may exceed 100 degrees. Dry and sunny conditions are expected.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Arapahoe	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Boulder	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Broomfield	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Denver	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Douglas	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Jefferson	200 PM TO 800 PM	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	MOD
Foothills above 6500ft
Boulder	100 PM TO 800 PM	0.1" (80%) to 0.3" (60%) to 0.9" (20%)	MOD
Douglas	100 PM TO 800 PM	0.1" (80%) to 0.3" (60%) to 0.9" (20%)	MOD
Jefferson	100 PM TO 800 PM	0.1" (80%) to 0.3" (60%) to 0.9" (20%)	MOD

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.