Time: 1012 AM Wed June 19, 2019 Forecaster: Nick Barlow

Heavy Precipitation Outlook
Flash Flood Prediction Program

WARMER WITH ISOLATED SHOWERS AND THUNDERSTORMS POSSIBLE
-Warmer temperatures arrive over NE Colorado on Wednesday, as a weak ridge of high pressure builds into the Central Rockies. Mostly-sunny skies will help afternoon temperatures climb into the low to mid 80s over the plains, with low to mid 70s expected for the foothills.
-Downsloping NW winds should effectively mix out low-level moisture along the Front Range throughout the day, leading to a decrease in shower and thunderstorm activity this afternoon and evening. Still, isolated showers and thunderstorms remain possible, but the threat for heavy rainfall is low.
-Today's showers and storms will track briskly to the SE at around 20-25mph, with the best chance for a storm over the District occurring between about 2pm-7pm.
STORM RAINFALL POTENTIAL AND DURATION: Showers and thunderstorms will produce rainfall amounts between 0.05-0.20" in 10-30 minutes.

WORST CASE SCENARIO: Surface moisture remains higher than expected, allowing a strong thunderstorm to produce rainfall between 0.20-0.50" in 10-30 minutes.

A LOOK AHEAD: Chances for showers and thunderstorms capable of measurable rainfall increase on Thursday, ahead of an anomalously-deep trough of low pressure digging into the Northern Rockies.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 200 PM TO 700 PM
0.1" (50%) to 0.3" (20%) to 0.5" (5%) LOW
Arapahoe 200 PM TO 700 PM
0.1" (50%) to 0.3" (20%) to 0.5" (5%) LOW
Boulder 200 PM TO 700 PM
0.1" (55%) to 0.3" (25%) to 0.5" (5%) LOW
Broomfield 200 PM TO 700 PM
0.1" (50%) to 0.3" (20%) to 0.5" (5%) LOW
Denver 200 PM TO 700 PM
0.1" (40%) to 0.3" (20%) to 0.5" (5%) LOW
Douglas 200 PM TO 700 PM
0.1" (60%) to 0.3" (25%) to 0.5" (5%) LOW
Jefferson 200 PM TO 700 PM
0.1" (60%) to 0.3" (25%) to 0.5" (5%) LOW
Foothills above 6500ft      
Boulder 100 PM TO 700 PM
0.1" (60%) to 0.3" (25%) to 0.5" (5%) LOW
Douglas 100 PM TO 700 PM
0.1" (65%) to 0.3" (30%) to 0.5" (10%) LOW
Jefferson 100 PM TO 700 PM
0.1" (65%) to 0.3" (30%) to 0.5" (10%) LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.