Time: 724 PM Sat August 20, 2022 Forecaster: Brad Simmons

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S CONTINUE VALID FOR THE ENTIRE DISTRICT/HEAVY RAINFALL THREAT QUICKLY DIMINISHING
-Message 1's will continue valid for all areas of the District until 9:30 PM but the threat for heavy rainfall is quickly diminishing.
-Isolated to widely scattered light rain showers will continue likely over the next few hours. With temperatures currently in the 60's the threat for thunderstorms is very low as the atmosphere is stabilizing. Mainly isolated light rain showers are expected for the remainder of the evening but should a thunderstorm develop it will have the potential to produce brief heavy rain.
-After 9 or 10pm conditions are expected to dry out for the remainder of the evening and overnight period.
STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will only produce a trace to 0.2" of rainfall in 10-30 minutes. Weak thunderstorms should they develop will have the potential to produce rainfall rates of 0.2-0.6" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm is able to develop producing rainfall rates of 0.4-1.0" in 10-30 minutes.

County Message Valid Times Prime Time
Wheat Ridge 1 Current TO 930 PM 330 PM TO 830 PM
Lakewood 1 Current TO 930 PM 330 PM TO 830 PM
the City of Aurora 1 Current TO 930 PM 330 PM TO 830 PM
Arvada 1 Current TO 930 PM 330 PM TO 830 PM
Arapahoe County 1 Current TO 930 PM 330 PM TO 830 PM
DIA 1 Current TO 930 PM 330 PM TO 830 PM
Denver County 1 Current TO 930 PM 330 PM TO 830 PM
Adams County 1 Current TO 930 PM 330 PM TO 830 PM
Douglas County 1 Current TO 930 PM 330 PM TO 830 PM
Broomfield County 1 Current TO 930 PM 330 PM TO 830 PM
Jefferson County 1 Current TO 930 PM 330 PM TO 830 PM
Boulder County 1 Current TO 930 PM 330 PM TO 830 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 930 PM SAT
Trace (80%) to 0.2" (30%) to 0.6" (5%) ISSUED
Arapahoe Current TO 930 PM SAT
Trace (75%) to 0.2" (25%) to 0.6" (5%) ISSUED
Boulder Current TO 930 PM SAT
Trace (90%) to 0.2" (40%) to 0.6" (10%) ISSUED
Broomfield Current TO 930 PM SAT
Trace (90%) to 0.2" (40%) to 0.6" (10%) ISSUED
Denver Current TO 930 PM SAT
Trace (75%) to 0.2" (25%) to 0.6" (5%) ISSUED
Douglas Current TO 930 PM SAT
Trace (80%) to 0.2" (30%) to 0.6" (5%) ISSUED
Jefferson Current TO 930 PM SAT
Trace (80%) to 0.2" (30%) to 0.6" (5%) ISSUED
Foothills above 6500ft      
Boulder Current TO 930 PM SAT
Trace (90%) to 0.2" (40%) to 0.6" (10%) ISSUED
Douglas Current TO 930 PM SAT
Trace (90%) to 0.2" (40%) to 0.6" (10%) ISSUED
Jefferson Current TO 930 PM SAT
Trace (90%) to 0.2" (40%) to 0.6" (10%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/