Time: 839 AM Wed May 27, 2020 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

WARM TODAY WITH A CHANCE FOR AFTERNOON/EVENING SHOWERS/THUNDERSTORMS
-NW flow aloft continues to dominate over the region today leading to mild conditions this morning as high temperatures reach the mid 70's to around 80 this afternoon. A disturbance will move in from the NW around midday resulting in a good chance for rain showers and isolated thunderstorms this afternoon with rain showers/isolated thunderstorm chances continuing into this evening.
-Shower and thunderstorm activity will develop over the Front Range foothills by around noon then storms will move onto the plains sometime between 1-2pm or shortly after. Storm motion today will be from NW to SE between 10-15mph. Relatively fast storm motion will help to limit point rainfall amounts but stronger storms will be capable of producing brief heavy rainfall. Typical thunderstorms will produce light to brief moderate rain, gusty winds and small hail.
-Prime time for thunderstorms will be between 1-9pm then the majority of the storm activity will have pushed SE of the District with lingering light rain showers possible through midnight.
STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak to moderate thunderstorms will produce a trace to 0.2" in 10-30 minutes. A strong thunderstorm will have the potential to produce 0.2-0.5" in 10-30 minutes.

WORST CASE SCENARIO: A slower moving strong thunderstorm formed off a boundary or training of moderate/strong thunderstorm cells may result in up to 1.0" of rain in 30-60 minutes.

A LOOK AHEAD: This active weather pattern will remain in place through the week and into the weekend with rain showers/thunderstorm chances every afternoon or evening. Temperatures over the next few days will remain seasonable in the 70's with generally mild mornings, with clouds increasing into the afternoon bringing rain shower/thunderstorm chances although the risk for widespread heavy rainfall should hold off until this weekend.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Arapahoe 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Boulder 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Broomfield 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Denver 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Douglas 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Jefferson 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Foothills above 6500ft      
Boulder 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Douglas 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
Jefferson 100 PM TO 1000 PM
Trace (60%) to 0.2" (40%) to 0.5" (10%) LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.