Time: 114 PM Fri June 30, 2023 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1’S WILL CONTINUE VALID UNTIL 6 PM
Message 1’s will continue to be valid until 6pm as the threat of heavy rainfall remains over the District.

An early morning round of showers/thunderstorms moved over the District and has continued eastward at this time. Another round of showers/thunderstorms is moving in from the W/NW and will likely impact the District over the next several hours.

Cooler temperatures behind the line of storms this morning could help limit the strength of storms into the afternoon. Although with some elevated spots of higher dew points, combined with the approaching upper-level disturbance, the threat of heavy rainfall will remain into the early evening hours.

A slight chance storms linger past 6pm, however, drier air will start to push into the region this evening which could help limit rainfall potential into the evening.
STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/isolated thunderstorms will produce 0.20-0.40” total, in 10-30 minutes. A moderate to heavy thunderstorm could produce 0.40-1.20” total, in 10-30 minutes.

WORST CASE SCENARIO: A stationary strong thunderstorm, or training of thunderstorm cells has the potential to produce 2.00” in 45-60 minutes.

County Message Valid Times Prime Time
Boulder County 1 Current TO 600 PM Current TO 530 PM
Jefferson County 1 Current TO 600 PM Current TO 530 PM
Broomfield County 1 Current TO 600 PM Current TO 530 PM
Douglas County 1 Current TO 600 PM Current TO 530 PM
Adams County 1 Current TO 600 PM Current TO 530 PM
Denver County 1 Current TO 600 PM Current TO 530 PM
DIA 1 Current TO 600 PM Current TO 530 PM
Arapahoe County 1 Current TO 600 PM Current TO 530 PM
the City of Aurora 1 Current TO 600 PM Current TO 530 PM
Arvada 1 Current TO 600 PM Current TO 530 PM
Wheat Ridge 1 Current TO 600 PM Current TO 530 PM
Lakewood 1 Current TO 600 PM Current TO 530 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Arapahoe Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Boulder Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Broomfield Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Denver Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Douglas Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Jefferson Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Foothills above 6500ft      
Boulder Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Douglas Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
Jefferson Current TO 600 PM FRI
0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/