Flash Flood Prediction Program

-	Message 1's will continue valid until 9:00 PM but the threat for heavy rainfall is diminishing now that temperatures are cooling.
-	A line of moderate to strong thunderstorms develop along a surface wind convergence line or Denver Convergence Vorticity Zone (DCVZ) that extended from Douglas County northeastward into Arapahoe and Adams County including the DIA portion of Denver County. These storms have peaked in intensity over the past hour and the boundary is washing out resulting in a lower threat for thunderstorms with the potential for heavy rainfall into the evening.
-	A weak gust front is progressing eastward from these original storms and when it reaches the foothills may generate new storms but with a cooling airmass the threat for new development is low. Should a new round of thunderstorms develop, stronger storms will have the potential to produce brief heavy rainfall.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a 0.2-0.6" of rainfall in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.0" in 10-30 minutes.

WORST CASE SCENARIO: A strong, stationary thunderstorm or training of thunderstorm may result in up to 2.0" of heavy rain in 45-60 minutes.

County	Message	Valid Times	Prime Time
Lakewood	1	100 PM TO 900 PM	200 PM TO 830 PM
Wheat Ridge	1	100 PM TO 900 PM	200 PM TO 830 PM
Arvada	1	100 PM TO 900 PM	200 PM TO 830 PM
the City of Aurora	1	100 PM TO 900 PM	200 PM TO 830 PM
Arapahoe County	1	100 PM TO 900 PM	200 PM TO 830 PM
DIA	1	100 PM TO 900 PM	200 PM TO 830 PM
Denver County	1	100 PM TO 900 PM	200 PM TO 830 PM
Adams County	1	100 PM TO 900 PM	200 PM TO 830 PM
Douglas County	1	100 PM TO 900 PM	200 PM TO 830 PM
Broomfield County	1	100 PM TO 900 PM	200 PM TO 830 PM
Jefferson County	1	100 PM TO 900 PM	200 PM TO 830 PM
Boulder County	1	100 PM TO 900 PM	200 PM TO 830 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM SUN	Trace (95%) to 0.2" (60%) to 0.6" (30%)	ISSUED
Arapahoe	Current TO 900 PM SUN	Trace (90%) to 0.2" (60%) to 0.6" (20%)	ISSUED
Boulder	Current TO 900 PM SUN	Trace (75%) to 0.2" (50%) to 0.6" (10%)	ISSUED
Broomfield	Current TO 900 PM SUN	Trace (75%) to 0.2" (50%) to 0.6" (10%)	ISSUED
Denver	Current TO 900 PM SUN	Trace (80%) to 0.2" (40%) to 0.6" (15%)	ISSUED
Douglas	Current TO 900 PM SUN	Trace (80%) to 0.2" (40%) to 0.6" (15%)	ISSUED
Jefferson	Current TO 900 PM SUN	Trace (75%) to 0.2" (50%) to 0.6" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 900 PM SUN	Trace (95%) to 0.2" (60%) to 0.6" (30%)	ISSUED
Douglas	Current TO 900 PM SUN	Trace (95%) to 0.2" (60%) to 0.6" (30%)	ISSUED
Jefferson	Current TO 900 PM SUN	Trace (95%) to 0.2" (60%) to 0.6" (30%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.