Time: 628 PM Sun July 25, 2021 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT
-Message 1's have been issued for the entire District and will remain valid until 9pm this evening.
-A gust front from the east has moved into the District this evening resulting in rapid storm development currently along the foothills. This storm development will continue over the next few hours and with very little storm movement, the chance for heavy rainfall has increased this evening. Additional storms could also develop along outflow boundaries for all areas of the District.
-Slow to nearly stationary storm motions will allow for extended periods of heavy rain under stronger storms that are able to develop this afternoon/evening which may lead to excessive runoff and possibly flash flooding.
STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.2-0.6" in 10-30 minutes. Strong thunderstorms have the potential to produce 0.4-1.2" of heavy rain in 10-30 minutes.

WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in up to 2.4" in 60- 90 minutes.

County Message Valid Times Prime Time
the City of Aurora 1 Current TO 900 PM Current TO 830 PM
Arapahoe County 1 Current TO 900 PM Current TO 830 PM
DIA 1 Current TO 900 PM Current TO 830 PM
Denver 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
Broomfield County 1 Current TO 900 PM Current TO 830 PM
Arvada 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
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 900 PM SUN
0.2" (30%) to 0.6" (10%) to 1.2" (5%) ISSUED
Arapahoe Current TO 900 PM SUN
0.2" (50%) to 0.6" (25%) to 1.2" (10%) ISSUED
Boulder Current TO 900 PM SUN
0.2" (75%) to 0.6" (40%) to 1.2" (20%) ISSUED
Broomfield Current TO 900 PM SUN
0.2" (75%) to 0.6" (40%) to 1.2" (20%) ISSUED
Denver Current TO 900 PM SUN
0.2" (50%) to 0.6" (25%) to 1.2" (10%) ISSUED
Douglas Current TO 900 PM SUN
0.2" (75%) to 0.6" (40%) to 1.2" (20%) ISSUED
Jefferson Current TO 900 PM SUN
0.2" (75%) to 0.6" (40%) to 1.2" (20%) ISSUED
Foothills above 6500ft      
Boulder Current TO 900 PM SUN
0.2" (80%) to 0.6" (50%) to 1.2" (30%) ISSUED
Douglas Current TO 900 PM SUN
0.2" (80%) to 0.6" (50%) to 1.2" (30%) ISSUED
Jefferson Current TO 900 PM SUN
0.2" (80%) to 0.6" (50%) to 1.2" (30%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/