Flash Flood Prediction Program

Message 1’s will be allowed to expire at 9:30pm as the threat of heavy rainfall has come to an end.

A couple of rounds of moderate to heavy showers impacted portions of the District this afternoon and early evening. Shower and thunderstorm activity has since moved eastward and out of the District. A few showers and isolated thunderstorms persist for areas north of the District and should remain north as they continue to move eastward. A very slight chance for a few showers to make it into northern portions of the District bringing minimal additional rainfall.

Temperatures overnight will decrease into the low 60s for the plains with mid to upper 50s along the foothills. Drier conditions move into the region tomorrow, keeping only a slight chance for a few late evening showers and possibly a thunderstorm or two. High temperatures tomorrow will also increase, likely jumping back into the 90s.

STORM RAINFALL POTENTIAL AND DURATION: A weak shower will produce a trace to 0.10” total in 10-30 minutes.

WORST CASE SCENARIO: A moderate to strong shower/thunderstorm will have the potential to produce 0.10-0.30” total in 10-30 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 930 PM	Current TO 900 PM
Jefferson County	1	Current TO 930 PM	Current TO 900 PM
Broomfield County	1	Current TO 930 PM	Current TO 900 PM
Douglas County	1	Current TO 930 PM	Current TO 900 PM
Adams County	1	Current TO 930 PM	Current TO 900 PM
Denver County	1	Current TO 930 PM	Current TO 900 PM
DIA	1	Current TO 930 PM	Current TO 900 PM
Arapahoe County	1	Current TO 930 PM	Current TO 900 PM
the City of Aurora	1	Current TO 930 PM	Current TO 900 PM
Arvada	1	Current TO 930 PM	Current TO 900 PM
Wheat Ridge	1	Current TO 930 PM	Current TO 900 PM
Lakewood	1	Current TO 930 PM	Current TO 900 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1159 PM MON	Trace (20%) to 0.1" (10%) to 0.3" (5%)	NONE
Arapahoe	Current TO 1159 PM MON	Trace (15%) to 0.1" (10%) to 0.3" (5%)	NONE
Boulder	Current TO 1159 PM MON	Trace (20%) to 0.1" (10%) to 0.3" (5%)	NONE
Broomfield	Current TO 1159 PM MON	Trace (20%) to 0.1" (10%) to 0.3" (5%)	NONE
Denver	Current TO 1159 PM MON	Trace (15%) to 0.1" (10%) to 0.3" (5%)	NONE
Douglas	Current TO 1159 PM MON	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Jefferson	Current TO 1159 PM MON	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Foothills above 6500ft
Boulder	Current TO 1159 PM MON	Trace (20%) to 0.1" (10%) to 0.3" (5%)	NONE
Douglas	Current TO 1159 PM MON	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Jefferson	Current TO 1159 PM MON	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.