Time: 554 PM Tue May 9, 2023 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 2:00 AM tomorrow morning.

Persistent easterly surface level flow, combined with an incoming upper-level disturbance has initiated a line of thunderstorms through the District at this time. These storms have rapidly developed and will be capable of heavy rainfall, which could produce localized flooding. The best chance for storms will be from now through 8pm with another round of overnight rain showers possible between 10pm and 2am.

Off and on rain shower chances will continue overnight and into daybreak Wednesday, however, the threat for heavy rainfall should diminish after 2am.
STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce 0.1-0.4" of rain in 30-60 minutes. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-0.8" in 10-30 minutes.

WORST CASE SCENARIO: Training of thunderstorm cells or a slower moving thunderstorm may result in up to 1.5" of rain in 60 minutes or less.

County Message Valid Times Prime Time
Boulder County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Jefferson County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Broomfield County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Douglas County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Adams County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Denver County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
DIA 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Arapahoe County 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
the City of Aurora 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Arvada 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Wheat Ridge 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM
Lakewood 1 Current TO 200 AM WEDNESDAY Current TO 1159 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Arapahoe Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Boulder Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Broomfield Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Denver Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Douglas Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Jefferson Current TO 200 AM WED
0.1" (75%) to 0.4" (50%) to 0.8" (20%) ISSUED
Foothills above 6500ft      
Boulder Current TO 200 AM WED
0.1" (50%) to 0.4" (30%) to 0.8" (10%) ISSUED
Douglas Current TO 200 AM WED
0.1" (50%) to 0.4" (30%) to 0.8" (10%) ISSUED
Jefferson Current TO 200 AM WED
0.1" (50%) to 0.4" (30%) to 0.8" (10%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/