Time: 1208 AM Sat June 3, 2023 Forecaster: Brad Simmons

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S CONTINUE VALID UNTIL 2:00 AM SATURDAY
Message 1’s will continue valid until 2:00 AM Saturday as moderate to brief heavy rain still lingers over southern areas of the District.

A boundary pushed back to the west into the District and produced thunderstorms with moderate heavy rainfall over the past few hours. These thunderstorms have peaked in intensity and are now weak to moderate for areas S of I-70. The weakening trend and southern progression of the rain is expected to continue over the next 1-2 hours and Messages will likely be allowed to expire.

Additional rain showers will likely re-develop after 2:00 AM and persist into daybreak Saturday but are expected to be light in intensity.
STORM RAINFALL POTENTIAL AND DURATION: Rain showers and 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
Boulder County 1 Current TO 200 AM Current TO 100 AM
Jefferson County 1 Current TO 200 AM Current TO 100 AM
Broomfield County 1 Current TO 200 AM Current TO 100 AM
Douglas County 1 Current TO 200 AM Current TO 100 AM
Adams County 1 Current TO 200 AM Current TO 100 AM
Denver County 1 Current TO 200 AM Current TO 100 AM
DIA 1 Current TO 200 AM Current TO 100 AM
Arapahoe County 1 Current TO 200 AM Current TO 100 AM
the City of Aurora 1 Current TO 200 AM Current TO 100 AM
Arvada 1 Current TO 200 AM Current TO 100 AM
Wheat Ridge 1 Current TO 200 AM Current TO 100 AM
Lakewood 1 Current TO 200 AM Current TO 100 AM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 200 AM SAT
0.1" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED
Arapahoe Current TO 200 AM SAT
0.1" (90%) to 0.3" (50%) to 0.8" (20%) ISSUED
Boulder Current TO 200 AM SAT
0.1" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED
Broomfield Current TO 200 AM SAT
0.1" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED
Denver Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (15%) ISSUED
Douglas Current TO 200 AM SAT
0.1" (100%) to 0.3" (60%) to 0.8" (30%) ISSUED
Jefferson Current TO 200 AM SAT
0.1" (90%) to 0.3" (50%) to 0.8" (20%) ISSUED
Foothills above 6500ft      
Boulder Current TO 200 AM SAT
0.1" (60%) to 0.3" (30%) to 0.8" (10%) ISSUED
Douglas Current TO 200 AM SAT
0.1" (80%) to 0.3" (40%) to 0.8" (15%) ISSUED
Jefferson Current TO 200 AM SAT
0.1" (60%) to 0.3" (30%) to 0.8" (10%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/