Flash Flood Prediction Program

Message 1’s will be allowed to expire at 11pm as the threat of heavy rainfall has come to an end.

A couple of strong storms impacted southern portions of the District this afternoon bringing moderate to heavy rainfall. A few showers and isolated thunderstorms persist for areas south of the District and will continue to move east/southeast through the evening. A few light showers may remain for southern portions of the District over the next couple of hours before showers activity comes to an end for the night.

Temperatures overnight will decrease to around 60 for the plains with mid 50s along the foothills. Similar conditions will remain in place for tomorrow with another good chance for isolated afternoon and evening showers/thunderstorms. An abundance of available moisture remains in place, both aloft and at the surface, which will result in a continued chance for moderate to heavy rainfall out of any storms that are able to develop.

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

WORST CASE SCENARIO: A moderate shower/ weak 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 1100 PM	Current TO 1030 PM
Jefferson County	1	Current TO 1100 PM	Current TO 1030 PM
Broomfield County	1	Current TO 1100 PM	Current TO 1030 PM
Douglas County	1	Current TO 1100 PM	Current TO 1030 PM
Adams County	1	Current TO 1100 PM	Current TO 1030 PM
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
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 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Arapahoe	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Boulder	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Broomfield	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Denver	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Douglas	Current TO 1159 PM SAT	Trace (30%) to 0.1" (15%) to 0.3" (5%)	NONE
Jefferson	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Foothills above 6500ft
Boulder	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Douglas	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE
Jefferson	Current TO 1159 PM SAT	Trace (10%) to 0.1" (5%) to 0.3" (0%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.