Flash Flood Prediction Program

-	Message 1's issued for the entire District will continue valid until 10:00 PM but may be rescinded early if conditions warrant.
-	Thunderstorms west of the District diminished upon approach but sent a rain cooled outflow boundary eastward which triggered new thunderstorms over Weld County and southward over parts of Douglas and Elbert Counties. The majority of this thunderstorm activity has remained outside the District boundaries. Storms to the N have initiated a new gust front which is pushing southward and may trigger new storms over the next few hours.
-	Thunderstorms if they develop will be slow moving or may anchor briefly resulting in a continued threat for heavy rain should a strong thunderstorm be observed. With cooler temperatures now in place the chance for strong thunderstorms is lower than earlier this afternoon and as temperatures continue to cool into the evening the chances for strong thunderstorms will continue to decrease.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will have the potential to produce 0.1-0.4" in 10-30 minutes. Strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.2" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving or briefly anchored strong thunderstorm may produce rainfall amounts of up to 2.0" in 45-75 minutes.

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

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM SUN	0.1" (50%) to 0.4" (25%) to 1.0" (10%)	ISSUED
Arapahoe	Current TO 1000 PM SUN	0.1" (75%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Boulder	Current TO 1000 PM SUN	0.1" (60%) to 0.4" (30%) to 1.0" (15%)	ISSUED
Broomfield	Current TO 1000 PM SUN	0.1" (50%) to 0.4" (25%) to 1.0" (10%)	ISSUED
Denver	Current TO 1000 PM SUN	0.1" (60%) to 0.4" (30%) to 1.0" (15%)	ISSUED
Douglas	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (40%) to 1.0" (20%)	ISSUED
Jefferson	Current TO 1000 PM SUN	0.1" (60%) to 0.4" (30%) to 1.0" (15%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Douglas	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (40%) to 1.0" (15%)	ISSUED
Jefferson	Current TO 1000 PM SUN	0.1" (80%) to 0.4" (40%) to 1.0" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.