Flash Flood Prediction Program

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

Stronger storms that formed inside the District have dissipated and are no longer a threat. A few lingering showers are moving off the foothills currently and are struggling to hold together as the airmass above the District is fairly stable at this time. A few showers could persist over the next couple of hours bringing some additional rainfall, however the threat for any heavy rainfall has ended as temperatures also have cooled into the 60s.

Skies will gradually clear through the rest of the evening with clear skies expected during the overnight. Overnight lows will drop into the upper 50s on the plains with low 50s along the foothills. Excess moisture at the surface could result in foggy conditions during the morning hours tomorrow which should quickly burn off after sunrise.

Tomorrows will be similar with another chance for moderate to heavy rain in the afternoon and early evening as thunderstorms once again impact the District.

STORM RAINFALL POTENTIAL AND DURATION: A few lingering showers will have potenial to produce T-0.20" total in 10-30 minutes.

WORST CASE SCENARIO: In the event an isolated stronger shower or thunderstorm develops, 0.20"-0.40” total is possible in 10-30 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 900 PM	Current TO 830 PM
Jefferson County	1	Current TO 900 PM	Current TO 830 PM
Broomfield County	1	Current TO 900 PM	Current TO 830 PM
Douglas County	1	Current TO 900 PM	Current TO 830 PM
Adams County	1	Current TO 900 PM	Current TO 830 PM
Denver County	1	Current TO 900 PM	Current TO 830 PM
DIA	1	Current TO 900 PM	Current TO 830 PM
Arapahoe County	1	Current TO 900 PM	Current TO 830 PM
the City of Aurora	1	Current TO 900 PM	Current TO 830 PM
Arvada	1	Current TO 900 PM	Current TO 830 PM
Wheat Ridge	1	Current TO 900 PM	Current TO 830 PM
Lakewood	1	Current TO 900 PM	Current TO 830 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Arapahoe	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Boulder	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Broomfield	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Denver	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Douglas	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Jefferson	Current TO 1100 PM SUN	Trace (30%) to 0.2" (15%) to 0.4" (5%)	NONE
Foothills above 6500ft
Boulder	Current TO 1100 PM SUN	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Douglas	Current TO 1100 PM SUN	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	Current TO 1100 PM SUN	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.