Flash Flood Prediction Program

Time: 949 AM Sun July 31, 2022 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- ISOLATED AFTERNOON TO EVENING SHOWERS/THUNDERSTORMS - Isolated to scattered thunderstorm activity is expected across the District today. Highs this afternoon will reach the low to mid 90's, dewpoints in the upper 40's to low 50's. Best chances for thunderstorms today will be across the foothills between 1pm-10pm. - Scattered showers and thunderstorms are expected to fire across higher terrain during the early afternoon hours. Storms will move east-southeast around 10-20 mph, becoming isolated as they traverse the plains. High-based storms will produce light to briefly moderate rainfall and gusty winds. - Dry conditions are expected for the remainder of the evening and overnight period. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak to briefly moderate thunderstorms will produce rainfall amounts of a trace to 0.4". WORST CASE SCENARIO: A stronger thunderstorm is able to develop with the potential to produce rainfall rates of 0.4-0.8" in 10-30 minutes. A LOOK AHEAD: High pressure ridging continues across the intermountain west, transporting monsoonal moisture into the state throughout the weekend and into next week. Temperatures remain hot this week as a heat wave builds into Colorado. Monday will be hot with a slight chance for afternoon thunderstorms and highs in the low to mid 90s. The warming trend continues Tuesday with temperatures in the low to mid 90s and a chance for afternoon isolated showers and thunderstorms. A cool front is expected to sweep across the plain Wednesday, bringing temperatures down to the mid 80s followed by a chance of afternoon showers and thunderstorms. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Arapahoe 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Boulder 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Broomfield 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Denver 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Douglas 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Jefferson 100 PM TO 1000 PM Trace (40%) to 0.4" (20%) to 0.8" (10%) LOW Foothills above 6500ft       Boulder 100 PM TO 1000 PM Trace (60%) to 0.4" (30%) to 0.8" (15%) LOW Douglas 100 PM TO 1000 PM Trace (60%) to 0.4" (30%) to 0.8" (15%) LOW Jefferson 100 PM TO 1000 PM Trace (60%) to 0.4" (30%) to 0.8" (15%) LOW MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]