Time: 918 AM Mon September 18, 2023 Forecaster: Laura Smith

Heavy Precipitation Outlook
Flash Flood Prediction Program

SLIGHT CHANGE FOR ISOLATED LATE AFTERNOON TO EVENING SHOWERS AND THUNDERSTORMS
A layer of high clouds has developed across the Front Range Urban Corridor this morning as light westerly flow aloft remains in place. Afternoon temperatures are expected to reach the low to mid 80s, with dew points in the 30s and PWAT values around 0.50”. These conditions support a chance for isolated showers and thunderstorms late this afternoon to evening. Storms are expected to dissipate by the evening hours, with skies gradually clearing overnight.
STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce light rainfall of up to 0.25” total in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm has the potential to produce up to 0.50” total rainfall 10-30 minutes.

A LOOK AHEAD: Tomorrow will be more active as a short wave traverses the state. Afternoon temperatures will be in the upper 70s to low 80s with isolated storms. Wednesday will be similar with high temperatures in the upper 70s to low 80s and isolated showers and thunderstorms. This pattern will remain in place through the remainder of the week with afternoon temperatures in the upper 70s to low 80s and a chance for isolated storms.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Arapahoe 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Boulder 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Broomfield 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Denver 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Douglas 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Jefferson 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Foothills above 6500ft      
Boulder 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Douglas 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
Jefferson 400 PM TO 900 PM
0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/