Time: 342 PM Fri August 19, 2022 Forecaster: Justin Brooks

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT
-Message 1's have been issued for the entire District and will be valid until 10:00 PM.
-A few storms have initiated along the higher terrain towards the west and south along the Palmer Divide. A boundary has set up from north to south from Brighton through Parker and is currently the focus point for stronger storm development this afternoon. Storm motions are generally expected from NW to SE between 5-10mph, however some storm motions today have been erratic as storms pulse up quickly, with additional storms developing off outflow boundaries which has increased the chance for brief heavy rainfall this afternoon and evening.
-The best chance for storms will be from now through 10pm this evening with stronger storms capable of producing heavy rainfall that may lead to excessive runoff. The largest threat today will be a quick 0.5" in 10-15 minutes. The stronger storms will likely be isolated with best chances along and E of I-25 at this time. Storm chances taper off after 10pm as the overnight dries out with mild conditions expected into daybreak Saturday.
STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-0.9" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving or briefly anchored strong thunderstorm may produce rainfall amounts of up to 1.8" in 45-75 minutes.

County Message Valid Times Prime Time
Boulder County 1 Current TO 1000 PM Current TO 900 PM
Jefferson County 1 Current TO 1000 PM Current TO 900 PM
Broomfield County 1 Current TO 1000 PM Current TO 900 PM
Douglas County 1 Current TO 1000 PM Current TO 900 PM
Adams County 1 Current TO 1000 PM Current TO 900 PM
Denver County 1 Current TO 1000 PM Current TO 900 PM
DIA 1 Current TO 1000 PM Current TO 900 PM
Arapahoe County 1 Current TO 1000 PM Current TO 900 PM
the City of Aurora 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 FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
Arapahoe Current TO 1000 PM FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
Boulder Current TO 1000 PM FRI
0.1" (40%) to 0.4" (20%) to 0.9" (10%) ISSUED
Broomfield Current TO 1000 PM FRI
0.1" (40%) to 0.4" (20%) to 0.9" (10%) ISSUED
Denver Current TO 1000 PM FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
Douglas Current TO 1000 PM FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
Jefferson Current TO 1000 PM FRI
0.1" (40%) to 0.4" (20%) to 0.9" (10%) ISSUED
Foothills above 6500ft      
Boulder Current TO 1000 PM FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
Douglas Current TO 1000 PM FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
Jefferson Current TO 1000 PM FRI
0.1" (50%) to 0.4" (25%) to 0.9" (15%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/