Flash Flood Prediction Program

Message 1’s will be allowed to expire at 9:00 PM as the threat of heavy rainfall has come to an end.

A few strong thunderstorms impacted the Denver Metro earlier this afternoon and have since moved eastward and out of the District. Some lingering showers persist for portions of the District at this time and will likely remain into the evening hours. There will be a slight chance for off and on showers and possibly a weak thunderstorm or two later this evening.

The best chance for additional showers will be between now-midnight with skies partially clearing through the overnight. Overnight temperatures will drop into the low 60s for the plains with mid to upper 50s along the foothills. Partly cloudy sky conditions are expected overnight and through daybreak tomorrow.

Tomorrow will bring another chance for moderate to heavy rainfall with a few rounds of storms possible in the afternoon and into the evening with the potential for a few showers to linger into the late evening hours.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace to 0.20" total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.20-0.40" total in 10- 30 minutes.

WORST CASE SCENARIO: If a stationary, strong thunderstorm is produced it will have the potential to have between 0.40- 0.80" total in 30-60 minutes.

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

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1159 PM SAT	Trace (60%) to 0.2" (30%) to 0.4" (15%)	NONE
Arapahoe	Current TO 1159 PM SAT	Trace (60%) to 0.2" (30%) to 0.4" (15%)	NONE
Boulder	Current TO 1159 PM SAT	Trace (60%) to 0.2" (30%) to 0.4" (15%)	NONE
Broomfield	Current TO 1159 PM SAT	Trace (50%) to 0.2" (25%) to 0.4" (10%)	NONE
Denver	Current TO 1159 PM SAT	Trace (60%) to 0.2" (30%) to 0.4" (15%)	NONE
Douglas	Current TO 1159 PM SAT	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	Current TO 1159 PM SAT	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Foothills above 6500ft
Boulder	Current TO 1159 PM SAT	Trace (50%) to 0.2" (30%) to 0.4" (15%)	NONE
Douglas	Current TO 1159 PM SAT	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	Current TO 1159 PM SAT	Trace (50%) to 0.2" (30%) to 0.4" (15%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.