Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 8:00pm this evening.
-	Abundant low-level moisture with dew points in the upper 50's to low 60's, combined with a weak disturbance from the W/NW has resulted in a chance for moderate to brief heavy rainfall this afternoon and early evening. Currently storms have formed along the higher terrain to the W and NW and will move into the District over the next hour or so with a couple of rounds of storms possible into the evening.
-	Storm motions will be from the W/NW to E/SE around 10mph, with some erratic storm movement likely off outflow boundaries as storms strengthen onto the plains with severe storms possible for areas east of I-25. After 8pm the stronger storms are expected to have moved east of the District, however a slight chance will remain for a late evening/overnight round of scattered rain showers/isolated thunderstorms.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak thunderstorms will produce a trace to 0.3" of rainfall. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving thunderstorm or briefly anchored thunderstorm may result in up to 1.5" of heavy rainfall in 45-60 minutes.

County	Message	Valid Times	Prime Time
Arapahoe County	1	200 PM TO 800 PM	300 PM TO 700 PM
DIA	1	200 PM TO 800 PM	300 PM TO 700 PM
Denver County	1	200 PM TO 800 PM	300 PM TO 700 PM
Adams County	1	200 PM TO 800 PM	300 PM TO 700 PM
Douglas County	1	200 PM TO 800 PM	300 PM TO 700 PM
Broomfield County	1	200 PM TO 800 PM	300 PM TO 700 PM
Jefferson County	1	200 PM TO 800 PM	300 PM TO 700 PM
Boulder County	1	200 PM TO 800 PM	300 PM TO 700 PM
Lakewood	1	200 PM TO 800 PM	300 PM TO 700 PM
Wheat Ridge	1	200 PM TO 800 PM	300 PM TO 700 PM
Arvada	1	200 PM TO 800 PM	300 PM TO 700 PM
the City of Aurora	1	200 PM TO 800 PM	300 PM TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 800 PM TUE	0.3" (50%) to 0.8" (40%) to 1.5" (20%)	ISSUED
Arapahoe	Current TO 800 PM TUE	0.3" (50%) to 0.8" (40%) to 1.5" (20%)	ISSUED
Boulder	Current TO 800 PM TUE	0.3" (50%) to 0.8" (20%) to 1.5" (10%)	ISSUED
Broomfield	Current TO 800 PM TUE	0.3" (50%) to 0.8" (20%) to 1.5" (10%)	ISSUED
Denver	Current TO 800 PM TUE	0.3" (50%) to 0.8" (20%) to 1.5" (10%)	ISSUED
Douglas	Current TO 800 PM TUE	0.3" (50%) to 0.8" (20%) to 1.5" (10%)	ISSUED
Jefferson	Current TO 800 PM TUE	0.3" (50%) to 0.8" (20%) to 1.5" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 800 PM TUE	0.3" (60%) to 0.8" (40%) to 1.5" (10%)	ISSUED
Douglas	Current TO 800 PM TUE	0.3" (60%) to 0.8" (40%) to 1.5" (10%)	ISSUED
Jefferson	Current TO 800 PM TUE	0.3" (60%) to 0.8" (40%) to 1.5" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.