Time: 859 AM Wed May 12, 2021 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

WARM AND SUNNY TODAY WITH A ERY SLIGHT CHANCE FOR SCATTERED AFTERNOON RAIN SHOWERS/THUNDERSTORMS
-Finally a day with some sunshine as a slow moving low-pressure system exits the region today. Temperatures on the plains this afternoon will reach the low 60's with 50's along the foothills. Some patchy fog over parts of the District this morning due to excess surface moisture which could bring a very slight chance for scattered afternoon rain showers/isolated thunderstorms as the sun comes out today and warms the surface.
-As the fog lifts, mostly sunny skies are expected through the morning with a very slight chance for some shower activity along the higher terrain around midday. NW flow aloft picks up in the afternoon bringing a chance for some rain shower/isolated thunderstorm activity across the District between 1-6pm with skies clearing into the evening. Typical rain showers, if they do develop, will produce between a TR-0.05" in 10-30 min, with an isolated 0.20" possible if a stronger cell is able to develop. Biggest threat today would be gusty winds under any showers/isolated thunderstorms that develop.
-Mild and dry conditions this evening and through the overnight as low temperatures are only expected to drop into the upper 30's to around 40 for the plains with low to mid 30's for the foothills.
STORM RAINFALL POTENTIAL AND DURATION: Rain showers or a weak thunderstorm will produce TR-0.05" in 10-30 minutes. A moderate thunderstorms will have the potential to produce 0.05-0.2" in 10-30 minutes.

WORST CASE SCENARIO: An anchored moderate/strong thunderstorm may result in up to 0.5" of rain in 60-90 minutes.

A LOOK AHEAD: Warmer, sunny and dry Thursday with high temperatures expected to reach the low 70's across the plains with 60's along the foothills. Similar conditions to start the day Friday with highs reaching the low to mid 70's. A chance Friday afternoon and evening for high-based scattered rain/isolated thunderstorms. Temperatures hold in the 70's Saturday as rain chances increase into the Weekend.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Arapahoe 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Boulder 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Broomfield 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Denver 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Douglas 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Jefferson 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Foothills above 6500ft      
Boulder 100 PM TO 600 PM
Trace (20%) to 0.1" (10%) NONE
Douglas 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
Jefferson 100 PM TO 600 PM
Trace (10%) to 0.1" (5%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.