Time: 154 PM Tue July 4, 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 effective until 11pm this evening.

A few isolated showers and weak thunderstorms have moved through the District today. Additional rounds of storms will be possible into the late evening with storm intensities likely increasing through the night as the upper-level disturbance moves overhead. The best chance for storms will be from now, through 11pm, with a slight chance Messages will need to be extended if strong storms continue into the overnight.

Storm motions will be relatively brisk from west to east between 10-20mph, which should help limit point rainfall amounts. However, there is a good chance additional storms will develop along the outflow boundaries. These outflow storms will have the highest potential for heavy rainfall. Storm may also become severe today, with large hail, strong winds and frequent cloud-to-ground lightning.
STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce 0.50-1.00” total in 10-30 minutes. Moderate to strong thunderstorms will produce 1.00-1.75” total in 10-30 minutes.

WORST CASE SCENARIO: A strong stationary storm, or training of moderate to strong thunderstorms will have the potential to produce up to 2.5” in under 60 minutes.

County Message Valid Times Prime Time
Boulder County 1 Current TO 1100 PM Current TO 1000 PM
Jefferson County 1 Current TO 1100 PM Current TO 1000 PM
Broomfield County 1 Current TO 1100 PM Current TO 1000 PM
Douglas County 1 Current TO 1100 PM Current TO 1000 PM
Adams County 1 Current TO 1100 PM Current TO 1000 PM
Denver County 1 Current TO 1100 PM Current TO 1000 PM
DIA 1 Current TO 1100 PM Current TO 1000 PM
Arapahoe County 1 Current TO 1100 PM Current TO 1000 PM
the City of Aurora 1 Current TO 1100 PM Current TO 1000 PM
Arvada 1 Current TO 1100 PM Current TO 1000 PM
Wheat Ridge 1 Current TO 1100 PM Current TO 1000 PM
Lakewood 1 Current TO 1100 PM Current TO 1000 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Arapahoe Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Boulder Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Broomfield Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Denver Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Douglas Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Jefferson Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Foothills above 6500ft      
Boulder Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Douglas Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
Jefferson Current TO 1100 PM TUE
0.5" (80%) to 1" (50%) to 1.75" (20%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/