Time: 441 PM Sun May 24, 2020 Forecaster: Brad Simmons

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S CONTINUE VALID/THREAT FOR HEAVY RAINFALL FROM THUNDERSTORMS HAS PASSED
-Message 1's will continue valid until 10:00 PM this evening although the threat for heavy rainfall from thunderstorms has passed.
-Now that temperatures have cooled into the 40's over the District a more straitiform rain has developed. Widespread rain showers currently blanket the area with rainfall rates generally in the 0.2-0.6"/hr range. A strong and persistent rain shower may result in rainfall rates reaching 1"/hr which could still result in excessive runoff in isolated areas.
-The moisture today is much needed as May has been a fairly dry month for the District. Rainfall totals since this morning currently range from as little as 0.3" to as much as 1.4". An additional 0.3-1.4" or more of rain is likely to fall into the evening. Showers are expected to gradually diminish from NW to SE.
STORM RAINFALL POTENTIAL AND DURATION: Rain showers will typically produce rainfall rates of 0.1-0.6"/hr. A persistent moderate rain shower may produce up to 1.0" in 1hr.

County Message Valid Times Prime Time
Boulder County 1 Current TO 1000 PM Current TO 800 PM
Jefferson County 1 Current TO 1000 PM Current TO 800 PM
Broomfield County 1 Current TO 1000 PM Current TO 800 PM
Douglas County 1 Current TO 1000 PM Current TO 800 PM
Adams County 1 Current TO 1000 PM Current TO 800 PM
Denver County 1 Current TO 1000 PM Current TO 800 PM
DIA 1 Current TO 1000 PM Current TO 800 PM
Arapahoe County 1 Current TO 1000 PM Current TO 800 PM
the City of Aurora 1 Current TO 1000 PM Current TO 800 PM
Arvada 1 Current TO 1000 PM Current TO 800 PM
Wheat Ridge 1 Current TO 1000 PM Current TO 800 PM
Lakewood 1 Current TO 1000 PM Current TO 800 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Arapahoe Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Boulder Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Broomfield Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Denver Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Douglas Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Jefferson Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Foothills above 6500ft      
Boulder Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Douglas Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
Jefferson Current TO 1000 PM SUN
0.1" (100%) to 0.4" (80%) to 1.0" (10%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.