Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will remain valid until 8:00 pm this evening.
-	Thunderstorms are beginning to develop over the higher terrain and along the Palmer Divide at this time. As these storms develop over the next hour or so, they will begin to move out onto the plains where rapid strengthening is expected with a chance of storms becoming severe along the I-25 corridor and eastward. Storms today will have heavy rainfall, strong winds, large hail and frequent lightning.
-	Storm motions will generally be W/NW to E/SE between 10-15 mph, with erratic storm motions possible if storms form off outflow boundaries or gust fronts. Outflow boundaries of gust fronts may also cause storms to anchor in place resulting in extended periods of heavy rainfall.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/thunderstorms will produce a 0.1-0.4" in 10-30 minutes. A moderate to strong thunderstorm will produce 0.4-1.2" in 10-30 minutes.

WORST CASE SCENARIO: A slow moving/stationary strong thunderstorm formed along an outflow boundary or gust front could produce up to 2.4" in 45-60 minutes.

County	Message	Valid Times	Prime Time
Lakewood	1	100 PM TO 800 PM	130 PM TO 700 PM
Wheat Ridge	1	100 PM TO 800 PM	130 PM TO 700 PM
Arvada	1	100 PM TO 800 PM	130 PM TO 700 PM
the City of Aurora	1	100 PM TO 800 PM	130 PM TO 700 PM
Arapahoe County	1	100 PM TO 800 PM	130 PM TO 700 PM
Denver County	1	100 PM TO 800 PM	130 PM TO 700 PM
DIA	1	100 PM TO 800 PM	130 PM TO 700 PM
Adams County	1	100 PM TO 800 PM	130 PM TO 700 PM
Boulder County	1	100 PM TO 800 PM	130 PM TO 700 PM
Jefferson County	1	100 PM TO 800 PM	130 PM TO 700 PM
Broomfield County	1	100 PM TO 800 PM	130 PM TO 700 PM
Douglas County	1	100 PM TO 800 PM	130 PM TO 700 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	1200 PM TO 800 PM	0.1" (60%) to 0.4" (40%) to 1.2" (20%)	ISSUED
Arapahoe	1200 PM TO 800 PM	0.1" (60%) to 0.4" (40%) to 1.2" (20%)	ISSUED
Boulder	1200 PM TO 800 PM	0.1" (60%) to 0.4" (20%) to 1.2" (5%)	ISSUED
Broomfield	1200 PM TO 800 PM	0.1" (60%) to 0.4" (20%) to 1.2" (5%)	ISSUED
Denver	1200 PM TO 800 PM	0.1" (60%) to 0.4" (40%) to 1.2" (20%)	ISSUED
Douglas	1200 PM TO 800 PM	0.1" (60%) to 0.4" (40%) to 1.2" (20%)	ISSUED
Jefferson	1200 PM TO 800 PM	0.1" (60%) to 0.4" (30%) to 1.2" (10%)	ISSUED
Foothills above 6500ft
Boulder	1200 PM TO 800 PM	0.1" (60%) to 0.4" (30%) to 1.2" (10%)	ISSUED
Douglas	1200 PM TO 800 PM	0.1" (60%) to 0.4" (30%) to 1.2" (10%)	ISSUED
Jefferson	1200 PM TO 800 PM	0.1" (60%) to 0.4" (30%) to 1.2" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.