Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 10pm this evening.
-	Thunderstorms are beginning to develop over the higher terrain to the west with thunderstorms expected to emerge onto the plains between 2-4pm. Prime time for thunderstorm activity is from 2:30-9pm. Additional showers and weaker thunderstorms will remain possible until midnight. 1-2 rounds of thunderstorms are expected with the initial round likely being the strongest.
-	Relatively slow storm motions from W to E at 10-15mph will allow for extended periods of heavy rain under stronger storms. Storm motions may become erratic at times due to outflow boundaries/gust front interactions.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.2-0.6" in 10-30 minutes. Strong thunderstorms have the potential to produce 0.6-1.8" of heavy rain in 10-30 minutes.

WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in up to 3.0" in 60 minutes or less.

County	Message	Valid Times	Prime Time
Boulder County	1	100 PM TO 1000 PM	200 PM TO 900 PM
Jefferson County	1	100 PM TO 1000 PM	200 PM TO 900 PM
Broomfield County	1	100 PM TO 1000 PM	230 PM TO 900 PM
Douglas County	1	100 PM TO 1000 PM	200 PM TO 900 PM
Adams County	1	100 PM TO 1000 PM	230 PM TO 900 PM
Denver County	1	100 PM TO 1000 PM	230 PM TO 900 PM
DIA	1	100 PM TO 1000 PM	230 PM TO 900 PM
Arapahoe County	1	100 PM TO 1000 PM	230 PM TO 900 PM
the City of Aurora	1	100 PM TO 1000 PM	230 PM TO 900 PM
Arvada	1	100 PM TO 1000 PM	230 PM TO 900 PM
Wheat Ridge	1	100 PM TO 1000 PM	230 PM TO 900 PM
Lakewood	1	100 PM TO 1000 PM	230 PM TO 900 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	300 PM TO 900 PM	0.2" (80%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Arapahoe	300 PM TO 900 PM	0.2" (90%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Broomfield	300 PM TO 900 PM	0.2" (80%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Denver	300 PM TO 900 PM	0.2" (80%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Boulder	200 PM TO 900 PM	0.2" (80%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Douglas	200 PM TO 900 PM	0.2" (90%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Jefferson	200 PM TO 900 PM	0.2" (80%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM WED	0.2" (95%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Douglas	Current TO 900 PM WED	0.2" (95%) to 0.6" (60%) to 1.8" (30%)	ISSUED
Jefferson	Current TO 900 PM WED	0.2" (95%) to 0.6" (60%) to 1.8" (30%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.