Time: 826 AM Wed June 24, 2020 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

WARM TODAY WITH A CHANCE OF AN ISOLATED HIGH BASED SHOWER/THUNDERSTORM
-Warmer today with high temperatures reaching the upper 80's to low 90's across the District with a slight chance for isolated high-based rain showers/isolated thunderstorms this afternoon and evening.
-High-based thunderstorms will first develop over the foothills and Palmer Divide between 12-2pm. After 2pm thunderstorms will be possible over the plains with best chances for thunderstorm activity through 8 or 9pm this evening.
-Surface moisture will be relatively dry through the early afternoon with dew points in the mid to upper 30's. With upper 80's to low 90's this will result high-based thunderstorms with gusty winds likely along with light to isolated moderate pockets of brief rain showers. Storm motions will be relatively fast from W to E between 10-15mph, which will limit point rainfall amounts across the District.
STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce a trace to 0.1" in 10-30 minutes. A Moderate thunderstorm will have the potential to produce 0.1-0.2" in 10-30 minutes

WORST CASE SCENARIO: A strong thunderstorm or a slower moving thunderstorm will have the potential to produce 0.2-0.5" in 10-30 minutes and up to 1.0" in 60 minutes or less.

A LOOK AHEAD: Similar conditions in place for Thursday as high temperatures remain in the upper 80's to low 90's. Another chance Thursday afternoon for afternoon rain showers/isolated thunderstorms. A cold front moves in overnight Thursday resulting in much cooler temperatures Friday in the low 80's along with an increased chance for rain showers/thunderstorms Friday afternoon and evening.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Arapahoe 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Boulder 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (20%) NONE
Broomfield 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Denver 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Douglas 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Jefferson 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Foothills above 6500ft      
Boulder 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (20%) NONE
Douglas 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
Jefferson 200 PM TO 900 PM
Trace (50%) to 0.1" (30%) to 0.2" (10%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.