Time: 133 AM Fri June 30, 2023 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1’S HAVE BEEN ISSUED FOR PORTIONS OF THE DISTRICT UNTIL 4AM
Message 1’s have been reissued for Arapahoe County, including Aurora, and Douglas County effective until 4am.

A moderate late evening thunderstorm moved through northern portions of the District setting off and outflow boundary into Douglas County. This has initiated strong storm development in these late hours and will likely continue for southern portions of the District through the early morning hours.

Storms have already produced over 1” of rainfall near the Lone Tree area, with storms continuing to move E/NE between 10-20mph at this time. Even with these speeds, quick heavy rainfall is expected under some of these storms as they continue eastward and out of the District by daybreak.
STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms have the potential to produce moderate to heavy rainfall of 0.20-0.40" total, in 10-30 minutes. Strong thunderstorms have the potential to produce moderate to heavy rainfall of 0.4-1.2" total, in 10-30 minutes.

WORST CASE SCENARIO: Stationary or training of slow-moving thunderstorms have the potential
to produce up to 2.0” total, in 45-60 minutes.

County Message Valid Times Prime Time
Boulder County 1 Current TO 400 AM Current TO 330 AM
Jefferson County 1 Current TO 400 AM Current TO 330 AM
Broomfield County 1 Current TO 400 AM Current TO 330 AM
Douglas County 1 Current TO 400 AM Current TO 330 AM
Adams County 1 Current TO 400 AM Current TO 330 AM
Denver County 1 Current TO 400 AM Current TO 330 AM
DIA 1 Current TO 400 AM Current TO 330 AM
Arapahoe County 1 Current TO 400 AM Current TO 330 AM
the City of Aurora 1 Current TO 400 AM Current TO 330 AM
Arvada 1 Current TO 400 AM Current TO 330 AM
Wheat Ridge 1 Current TO 400 AM Current TO 330 AM
Lakewood 1 Current TO 400 AM Current TO 330 AM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
Arapahoe Current TO 400 AM FRI
0.2" (75%) to 0.4" (50%) to 1.2" (25%) ISSUED
Boulder Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
Broomfield Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
Denver Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
Douglas Current TO 400 AM FRI
0.2" (75%) to 0.4" (50%) to 1.2" (25%) ISSUED
Jefferson Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
Foothills above 6500ft      
Boulder Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
Douglas Current TO 400 AM FRI
0.2" (60%) to 0.4" (30%) to 1.2" (10%) ISSUED
Jefferson Current TO 400 AM FRI
0.2" (15%) to 0.4" (10%) to 1.2" (5%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/