Flash Flood Prediction Program

Time: 935 AM Tue September 19, 2023 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- ISOLATED AFTERNOON TO EVENING SHOWERS AND THUNDERSTORMS An active weather pattern is expected across the District as a short wave traverses the state today. High temperatures will reach the upper 70s to low 80s with isolated storms rolling off the foothills around mid afternoon. Dewpoints will range from the mid to upper 30s, with PWAT values around 0.60”, supporting brief periods of light rain and gusty winds. Storm motions will be from west to east and are expected to clear the area by mid evening. Skies will gradually clear 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: A warming and drying pattern will emerge tomorrow and Thursday with mostly sunny skies and high temperatures in the low to mid 80s. On Friday evening, a cold front is expected to traverse the High Plains supporting a slight chance for evening storms. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Arapahoe 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Boulder 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Broomfield 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Denver 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Douglas 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Jefferson 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Foothills above 6500ft       Boulder 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Douglas 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE Jefferson 300 PM TO 900 PM 0.05" (75%) to 0.15" (50%) to 0.25" (25%) NONE MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]