Time: 221 PM Wed August 2, 2023 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

ANOTHER GOOD CHANCE FOR SHOWERS/THUNDERSTORMS ACROSS THE DISTRICT THIS AFTERNOON AND EVENING.
Message 1’s have been issued for the entire District effective until 9pm.

A few isolated storms have formed along the higher terrain west of the District and will move through the District over the next several hours before storm chances taper off after sundown. A couple of rounds of storms will be possible through the evening with a slight chance for a few off and on showers through the overnight. Storms will be hit or miss today, leading to some areas likely staying dry.

A boundary has been set up along the eastern portion of the District which will be a focal point for stronger storm development heading into the late afternoon/early evening. Storm motions will typically be from west to east between 10-20mph, which should help limit point rainfall amounts. However, additional storms that form along outflow boundaries have the potential to stall out and bring moderate to heavy rainfall for an extended period of time. These storms will likely have the best chance of heavy rainfall leading to LOW IMPACT FLOODING with both threats of a quick 0.5” in 10-15 minutes. The best chance for stronger storms will be from the initial wave of storms, with subsequent waves of showers decreasing with intensity through the evening.
STORM RAINFALL POTENTIAL AND DURATION: Typical showers/weak thunderstorms will produce a 0.05-0.25” total, in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.25-0.75” total in 10-30 minutes. Strong thunderstorms will produce 0.75-1.50” total in 10-30 minutes.

WORST CASE SCENARIO: A stronger, stalled out thunderstorm is able to develop and will have the potential to produce up to 2.50” total, in 45-60 minutes.

County Message Valid Times Prime Time
Wheat Ridge 1 Current TO 900 PM Current TO 830 PM
Lakewood 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
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
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

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Arapahoe Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Boulder Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Broomfield Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Denver Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Douglas Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Jefferson Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Foothills above 6500ft      
Boulder Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Douglas Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
Jefferson Current TO 900 PM WED
0.25" (50%) to 0.75" (25%) to 1.5" (10%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/