Time: 1000 AM Tue July 4, 2023 Forecaster: Laura Smith

Heavy Precipitation Outlook
Flash Flood Prediction Program

STRONG THUNDERSTORMS AND HEAVY RAIN TODAY AND TONIGHT
Today will be an active day across the Front Range Urban Corridor as a strong cold front approaches from the north. High temperatures will reach the mid 80s, dew points in the low 50s, precipitable water (PWAT) values around 1.00 inch support an environment favorable for scattered to widespread showers and thunderstorms. Storms are expected to initiate during the early afternoon hours along the foothills before moving into the District. Thunderstorms and heavy rainfall will persist into the evening and perhaps overnight hours as the cold front works its way across the High Plains.
STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms have the potential to produce moderate to heavy rainfall of 0.75” to 1.25” in 10-30 minutes. Strong thunderstorms have the potential to produce very heavy rainfall of 1.25” to 1.75” in 10-30 minutes.

WORST CASE SCENARIO: Training or anchored thunderstorms have the potential to produce 1.75” to 2.50” in 60 minutes.

A LOOK AHEAD: Chances for showers and thunderstorms along with locally heavy rainfall will continue through Wednesday with cooler temperatures in the upper 60s to low 70s.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Arapahoe 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Boulder 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Broomfield 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Denver 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Douglas 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Jefferson 100 PM TO 1200 AM WED
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Foothills above 6500ft      
Boulder 1200 PM TO 1100 PM
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Douglas 1200 PM TO 1100 PM
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
Jefferson 1200 PM TO 1100 PM
0.5" (85%) to 1.25" (50%) to 1.75" (15%) HIGH
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/