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.

A few lingering showers persist over the District at this time. These showers will continue over the next couple of hours before clearing out through the overnight. Temperatures will drop into the low 60s by daybreak tomorrow for the plains with mid to upper 50s along the foothills.

Minimal change to the upper-level flow tomorrow, combined with an uptick in moisture will result in another chance for widespread showers and thunderstorms across the District with a slight chance for severe weather. Similar timing is expected with storms initiating around midday along the foothills with multiple rounds of storms possible into the late evening hours for the District.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace-0.10” total in 10-30 minutes. A moderate shower will produce 0.10-0.20” total in 10-30 minutes.

WORST CASE SCENARIO: A 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 930 PM
Jefferson County	1	Current TO 1000 PM	Current TO 930 PM
Broomfield County	1	Current TO 1000 PM	Current TO 930 PM
Douglas County	1	Current TO 1000 PM	Current TO 930 PM
Adams County	1	Current TO 1000 PM	Current TO 930 PM
Denver County	1	Current TO 1000 PM	Current TO 930 PM
DIA	1	Current TO 1000 PM	Current TO 930 PM
Arapahoe County	1	Current TO 1000 PM	Current TO 930 PM
the City of Aurora	1	Current TO 1000 PM	Current TO 930 PM
Arvada	1	Current TO 1000 PM	Current TO 930 PM
Wheat Ridge	1	Current TO 1000 PM	Current TO 930 PM
Lakewood	1	Current TO 1000 PM	Current TO 930 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 0.1" (20%) to 0.2" (10%)	NONE
Arapahoe	Current TO 1159 PM MON	Trace (40%) to 0.1" (20%) to 0.2" (10%)	NONE
Boulder	Current TO 1159 PM MON	Trace (40%) to 0.1" (20%) to 0.2" (10%)	NONE
Broomfield	Current TO 1159 PM MON	Trace (40%) to 0.1" (20%) to 0.2" (10%)	NONE
Denver	Current TO 1159 PM MON	Trace (40%) to 0.1" (20%) to 0.2" (10%)	NONE
Douglas	Current TO 1159 PM MON	Trace (40%) to 0.1" (20%) to 0.2" (10%)	NONE
Jefferson	Current TO 1159 PM MON	Trace (40%) to 0.1" (20%) to 0.2" (10%)	NONE
Foothills above 6500ft
Boulder	Current TO 1159 PM MON	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Douglas	Current TO 1159 PM MON	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Jefferson	Current TO 1159 PM MON	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.