Flash Flood Prediction Program

Message 1’s will be allowed to expire at 10pm as the threat of heavy rainfall has come to an end.

After a long-lasting round of widespread moderate to heavy rainfall, only a few isolated showers persist over eastern portions of the District. These showers will slowly meander eastward through the rest of the evening with skies gradually clearing behind. A few additional showers may develop late this evening brining, favoring east/southeast portions of the District.

Temperatures overnight will decrease into the low to mid 60s for the plains with upper 50s to around 60 degrees along the foothills. Similar conditions will remain in place for tomorrow with another good chance for widespread afternoon and evening showers/thunderstorms. An abundance of available moisture, both aloft and now at the surface will result in 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 0.20” total in 10-30 minutes.

WORST CASE SCENARIO: A stronger shower/thunderstorm will have the potential to produce 0.20-0.40” total in 10-30 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 1000 PM	Current TO 1000 PM
Jefferson County	1	Current TO 1000 PM	Current TO 1000 PM
Broomfield County	1	Current TO 1000 PM	Current TO 1000 PM
Douglas County	1	Current TO 1000 PM	Current TO 1000 PM
Adams County	1	Current TO 1000 PM	Current TO 1000 PM
Denver County	1	Current TO 1000 PM	Current TO 1000 PM
DIA	1	Current TO 1000 PM	Current TO 1000 PM
Arapahoe County	1	Current TO 1000 PM	Current TO 1000 PM
the City of Aurora	1	Current TO 1000 PM	Current TO 1000 PM
Arvada	1	Current TO 1000 PM	Current TO 1000 PM
Wheat Ridge	1	Current TO 1000 PM	Current TO 1000 PM
Lakewood	1	Current TO 1000 PM	Current TO 1000 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1159 PM MON	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Arapahoe	Current TO 1159 PM MON	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Boulder	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Broomfield	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Denver	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Douglas	Current TO 1159 PM MON	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Foothills above 6500ft
Boulder	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Douglas	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Jefferson	Current TO 1159 PM MON	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.