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. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]