Flash Flood Prediction Program

-	Thunderstorms have developed over Larimer and Weld Counties and are moving southeastward and will likely impact portions of the District into the evening. These storms are relatively fast moving and and high-based resulting in gusty winds and light to moderate rain from the typical storms.
-	A stronger slow moving thunderstorm will be able to moisten the air underneath and will be capable of producing brief heavy rainfall which may result in Message 1's being issued shortly.
-	Prime time for thunderstorm activity will be from 9pm until around midnight. Best chances for stronger storms will be along and E of I-25 with lesser chances for strong storms over the foothills. Thunderstorms may also contain hail and gusty winds in excess of 40mph.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce rainfall rates of 0.1-0.4" in 10-30 minutes. Strong thunderstorms will have the potential to produce brief heavy rainfall of 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: Training of thunderstorm cells or a slower moving strong thunderstorm will have the potential to produce up to 1.4" of rain in 45-60 minutes.

A LOOK AHEAD: Conditions over the District will be dry on Saturday with temperatures continuing to run above seasonal averages.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	800 PM TO 100 AM SAT	0.1" (75%) to 0.3" (50%) to 0.8" (15%)	HIGH
Arapahoe	800 PM TO 100 AM SAT	0.1" (75%) to 0.3" (50%) to 0.8" (15%)	HIGH
Boulder	800 PM TO 100 AM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (5%)	LOW
Broomfield	800 PM TO 100 AM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (5%)	LOW
Denver	800 PM TO 100 AM SAT	0.1" (75%) to 0.3" (50%) to 0.8" (15%)	HIGH
Douglas	800 PM TO 100 AM SAT	0.1" (75%) to 0.3" (50%) to 0.8" (15%)	HIGH
Jefferson	800 PM TO 100 AM SAT	0.1" (60%) to 0.3" (30%) to 0.8" (5%)	LOW
Foothills above 6500ft
Boulder	800 PM TO 100 AM SAT	0.1" (40%) to 0.3" (20%) to 0.8" (5%)	LOW
Douglas	800 PM TO 100 AM SAT	0.1" (40%) to 0.3" (20%) to 0.8" (5%)	LOW
Jefferson	800 PM TO 100 AM SAT	0.1" (40%) to 0.3" (20%) to 0.8" (5%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.