Time: 616 PM Wed May 31, 2023 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S CONTINUE VALID
Message 1’s will continue valid until 10pm as the threat of heavy rain remains into this evening.

An explosive round of thunderstorms impacted parts of the District this afternoon and have since moved N/NE and out of the District. These storms contained lots of hail, rather than heavy rainfall with very gusty winds resulting in a few severe thunderstorms. A couple of gust fronts continue to initiate storms relatively close to the eastern edge of the District and these storms could trend into the District into the later evening. As we move closer to nightfall, the chances for explosive development leading to hail will diminish, however, the chance for moderate to heavy rainfall will likely persist into the evening.

The best chance for additional storms will be from now through 10pm with lingering showers possible through midnight. Storm motions continue to be from south to north, between 5-10mph, with some erratic storm movement off gust fronts possible through the rest of the evening. Skies will gradually clear after midnight with overnight lows dropping to into the low 50’s.
STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce TR-0.25” of rain in 10-30 minutes. Strong thunderstorms will have the potential to produce rainfallrates of 0.25-0.75" in 10-30 minutes.

WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in up to 1.25” of rain
in 45-75 minutes.

County Message Valid Times Prime Time
the City of Aurora 1 Current TO 1000 PM Current TO 900 PM
Arapahoe County 1 Current TO 1000 PM Current TO 900 PM
DIA 1 Current TO 1000 PM Current TO 900 PM
Denver County 1 Current TO 1000 PM Current TO 900 PM
Adams County 1 Current TO 1000 PM Current TO 900 PM
Douglas County 1 Current TO 1000 PM Current TO 900 PM
Broomfield County 1 Current TO 1000 PM Current TO 900 PM
Jefferson County 1 Current TO 1000 PM Current TO 900 PM
Boulder County 1 Current TO 1000 PM Current TO 900 PM
Arvada 1 Current TO 1000 PM Current TO 900 PM
Wheat Ridge 1 Current TO 1000 PM Current TO 900 PM
Lakewood 1 Current TO 1000 PM Current TO 900 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Arapahoe Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Boulder Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Broomfield Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Denver Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Douglas Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Jefferson Current TO 1000 PM WED
Trace (50%) to 0.25" (25%) to 0.75" (10%) ISSUED
Foothills above 6500ft      
Boulder Current TO 1000 PM WED
Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED
Douglas Current TO 1000 PM WED
Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED
Jefferson Current TO 1000 PM WED
Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/