Time: 324 PM Wed July 19, 2023 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1’S HAVE BEEN ISSUED FOR THE ENTIRE DISTRICT
Message 1’s have been issued for the entire District and will be valid until 8:00 PM this evening.

A potent, quick moving line of storms is approaching the District at this time with some pockets of heavy rainfall possible over the next couple of hours. The main threat with these cells will be a quick 0.5” in 10-15 minutes as storm movements remain fairly brisk between 20-30mph from west to east. A slight chance a few of these storms produce outflow boundaries, which could increase the threat of localized heavy rainfall as well.

The best chance for storms will be from now through 8pm with a few lingering off and on showers possible into the late evening. These later storms will also be moving quickly from west to east between 20-30mph which should continue to help limit point rainfall amounts.
STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce a 0.1-0.4” of rain. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.0” in
10-30 minutes.

WORST CASE SCENARIO: Training of moderate to strong thunderstorm cells may result in up to 1.6” of rain in 45-75 minutes.

County Message Valid Times Prime Time
Boulder County 1 Current TO 800 PM Current TO 700 PM
Jefferson County 1 Current TO 800 PM Current TO 700 PM
Broomfield County 1 Current TO 800 PM Current TO 700 PM
Douglas County 1 Current TO 800 PM Current TO 700 PM
Adams County 1 Current TO 800 PM Current TO 700 PM
Denver County 1 Current TO 800 PM Current TO 700 PM
DIA 1 Current TO 800 PM Current TO 700 PM
Arapahoe County 1 Current TO 800 PM Current TO 700 PM
the City of Aurora 1 Current TO 800 PM Current TO 700 PM
Arvada 1 Current TO 800 PM Current TO 700 PM
Wheat Ridge 1 Current TO 800 PM Current TO 700 PM
Lakewood 1 Current TO 800 PM Current TO 700 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Arapahoe Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Boulder Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Broomfield Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Denver Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Douglas Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Jefferson Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Foothills above 6500ft      
Boulder Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Douglas Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
Jefferson Current TO 800 PM WED
0.1" (60%) to 0.4" (30%) to 1" (15%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/