Time: 930 PM Fri June 2, 2023 Forecaster: Brad Simmons

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S HAVE BEEN RE-ISSUED AND WILL BE VALID UNTIL 2:00 AM SATURDAY
Message 1’s will be allowed to expire as the threat for heavy rainfall has ended at least temporarily.

A boundary has pushed back to the west into the District and thunderstorms are developing at this time over parts of Jefferson County. Elevated surface moisture levels will allow storms to be able to produce heavy rain that may lead to excessive runoff. Storms will most likely be pulse-like and move very little from their initiation point. The slow moving nature of the storms may allow for extended periods of moderate to heavy rainfall.

Best chances for thunderstorms will be over the next 3-4 hours then precipitation should favor light non-thunderstorm rain showers into Saturday morning.
STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce 0.1-0.3" in 10-30 minutes. A moderate to strong thunderstorm may result in rainfall rates of 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A moderate to strong stationary thunderstorm may result in up to 1.6” in 45-75 minutes.

County Message Valid Times Prime Time
the City of Aurora 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Arapahoe County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
DIA 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Denver County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Douglas County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Adams County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Broomfield County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Arvada 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Jefferson County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Boulder County 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Wheat Ridge 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY
Lakewood 1 Current TO 200 AM SATURDAY Current TO 100 AM SATURDAY

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 200 AM SAT
0.1" (90%) to 0.3" (60%) to 0.8" (30%) ISSUED
Arapahoe Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
Boulder Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
Broomfield Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
Denver Current TO 200 AM SAT
0.1" (90%) to 0.3" (60%) to 0.8" (30%) ISSUED
Douglas Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
Jefferson Current TO 200 AM SAT
0.1" (90%) to 0.3" (60%) to 0.8" (30%) ISSUED
Foothills above 6500ft      
Boulder Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
Douglas Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
Jefferson Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/