Flash Flood Prediction Program

Message 1’s will continue valid until 10:00pm as the threat of heavy rainfall continues. So far, most areas in the District have remained dry as suppressed temperatures resulted in little to no storm development. Another line of showers/isolated thunderstorms is moving into the District from the NW and will move SE through the District over the next few hours. A gust front from stronger storms NE is accompanying this line and could trigger some stronger storms as they move through the District. The best chance for storms will be from now through 10pm with a few lingering isolated light showers favoring SE portions of the District. Overnight will clear out with lows dropping into the 60s.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce rainfall of 0.05" to 0.25” total in 10-30 minutes. Moderate to strong showers have the potential to produce rainfall of 0.25 to 0.75” total in 10-30 minutes.

WORST CASE SCENARIO: Strong stationery, or training of thunderstorms has the potential to produce 0.75” to 1.50” in under 60 minutes.

County	Message	Valid Times	Prime Time
Denver County	1	Current TO 1100 PM	Current TO 1030 PM
DIA	1	Current TO 1100 PM	Current TO 1030 PM
Arapahoe County	1	Current TO 1100 PM	Current TO 1030 PM
Adams County	1	Current TO 1100 PM	Current TO 1030 PM
Douglas County	1	Current TO 1100 PM	Current TO 1030 PM
Broomfield County	1	Current TO 1100 PM	Current TO 1030 PM
Jefferson County	1	Current TO 1100 PM	Current TO 1030 PM
Boulder County	1	Current TO 1100 PM	Current TO 1030 PM
the City of Aurora	1	Current TO 1100 PM	Current TO 1030 PM
Arvada	1	Current TO 1100 PM	Current TO 1030 PM
Wheat Ridge	1	Current TO 1100 PM	Current TO 1030 PM
Lakewood	1	Current TO 1100 PM	Current TO 1030 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Arapahoe	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Boulder	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Broomfield	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Denver	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Douglas	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Jefferson	Current TO 1000 PM MON	0.05" (75%) to 0.25" (50%) to 0.75" (25%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 1000 PM MON	0.05" (80%) to 0.25" (60%) to 0.75" (30%)	ISSUED
Douglas	Current TO 1000 PM MON	0.05" (80%) to 0.25" (60%) to 0.75" (30%)	ISSUED
Jefferson	Current TO 1000 PM MON	0.05" (80%) to 0.25" (60%) to 0.75" (30%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.