Flash Flood Prediction Program

-	Message 1's have been issued for southern portions of the District including Arapahoe, Denver, Douglas and Jefferson Counties.
-	Thunderstorm chances will be minimal north of I-70 but thunderstorms are currently underway over southern areas of the District in Douglas and Jefferson Counties at this time. Strong thunderstorms will be capable of producing brief heavy rainfall, gusty winds and hail.
-	Thunderstorms will move from WNW to ESE at around 20mph. If the storms over southern areas of the District produce an outflow boundary/gust front that pushes northward additional Counties may need to be upgraded to Message 1's as well.

STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorm may produce 0.3-0.7" in 10-30 minutes. Slower moving strong thunderstorms or large thunderstorms may produce up to 1.5" in 45-90 minutes.

WORST CASE SCENARIO: A strong thunderstorm becomes stationary with the potential to produce up to 2.3" in 60-90 minutes.

County	Message	Valid Times	Prime Time
Jefferson County	1	Current TO 800 PM	145 PM TO 700 PM
Douglas County	1	Current TO 800 PM	145 PM TO 700 PM
Denver County	1	Current TO 800 PM	145 PM TO 700 PM
Arapahoe County	1	Current TO 800 PM	145 PM TO 700 PM
the City of Aurora	1	Current TO 800 PM	145 PM TO 700 PM
Arvada	1	Current TO 800 PM	145 PM TO 700 PM
Wheat Ridge	1	Current TO 800 PM	145 PM TO 700 PM
Lakewood	1	Current TO 800 PM	145 PM TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 800 PM MON	0.1" (30%) to 0.3" (20%) to 0.8" (10%)	LOW
Arapahoe	Current TO 800 PM MON	0.1" (75%) to 0.3" (40%) to 0.8" (20%)	ISSUED
Boulder	Current TO 800 PM MON	0.1" (30%) to 0.3" (20%) to 0.8" (10%)	LOW
Broomfield	Current TO 800 PM MON	0.1" (30%) to 0.3" (20%) to 0.8" (10%)	LOW
Denver	Current TO 800 PM MON	0.1" (65%) to 0.3" (35%) to 0.8" (15%)	ISSUED
Douglas	Current TO 800 PM MON	0.1" (95%) to 0.3" (75%) to 0.8" (35%)	ISSUED
Jefferson	Current TO 800 PM MON	0.1" (85%) to 0.3" (65%) to 0.8" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 800 PM MON	0.1" (30%) to 0.3" (20%) to 0.8" (10%)	LOW
Douglas	Current TO 800 PM MON	0.1" (95%) to 0.3" (75%) to 0.8" (35%)	ISSUED
Jefferson	Current TO 800 PM MON	0.1" (85%) to 0.3" (65%) to 0.8" (25%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.