Flash Flood Prediction Program

-	Message 1's have been issued for the entire District until 8:00pm.
-	Thunderstorms are developing over the Jefferson and Boulder County foothills at this time. As temperatures continue to warm up on the plains, the atmosphere will further destabilize with thunderstorms likely to increase in coverage and move onto the plains in the next 1-2 hours.
-	Thunderstorms will track to the E/NE at around 12-17mph across the District this afternoon. Storms could become strong or severe with the potential for heavy rain, large hail, and gusty straight-line winds. The greatest threat for strong/severe storms and heavy rainfall will be through late afternoon, with decreasing chances heading into the evening.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce rainfall amounts of 0.1-0.4" in 10-30 minutes. Strong/severe thunderstorms will produce rainfall amounts of 0.4-1.0" in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving severe thunderstorm produces heavy rainfall of up to 2.25" in 60-90 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 800 PM	100 PM TO 600 PM
Jefferson County	1	Current TO 800 PM	100 PM TO 600 PM
Broomfield County	1	Current TO 800 PM	100 PM TO 600 PM
Douglas County	1	Current TO 800 PM	100 PM TO 600 PM
Adams County	1	Current TO 800 PM	100 PM TO 600 PM
Denver County	1	Current TO 800 PM	100 PM TO 600 PM
DIA	1	Current TO 800 PM	100 PM TO 600 PM
Arapahoe County	1	Current TO 800 PM	100 PM TO 600 PM
the City of Aurora	1	Current TO 800 PM	100 PM TO 600 PM
Arvada	1	Current TO 800 PM	100 PM TO 600 PM
Wheat Ridge	1	Current TO 800 PM	100 PM TO 600 PM
Lakewood	1	Current TO 800 PM	100 PM TO 600 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 800 PM SUN	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED
Arapahoe	Current TO 800 PM SUN	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED
Boulder	Current TO 800 PM SUN	0.1" (85%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Broomfield	Current TO 800 PM SUN	0.1" (85%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Denver	Current TO 800 PM SUN	0.1" (90%) to 0.4" (55%) to 1.0" (25%)	ISSUED
Douglas	Current TO 800 PM SUN	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED
Jefferson	Current TO 800 PM SUN	0.1" (90%) to 0.4" (55%) to 1.0" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 800 PM SUN	0.1" (95%) to 0.4" (50%) to 1.0" (20%)	ISSUED
Douglas	Current TO 800 PM SUN	0.1" (95%) to 0.4" (60%) to 1.0" (30%)	ISSUED
Jefferson	Current TO 800 PM SUN	0.1" (95%) to 0.4" (55%) to 1.0" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.