Flash Flood Prediction Program

Time: 938 AM Wed September 20, 2023 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- WARM AND SUNNY CONDITIONS WITH ISOLATED SHOWERS ALONG THE FOOTHILLS Mostly sunny conditions are expected across the District today as a ridge of high pressure begins building across the Four Corners region. Afternoon temperatures will reach the upper 70s to low 80s with dewpoints in the mid to upper 30s. A few isolated showers are possible this afternoon over complex terrain but are not expected to move onto the plains. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce light rainfall of up to 0.15” total in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm has the potential to produce up to 0.30” total rainfall 10-30 minutes. A LOOK AHEAD: A drying pattern emerges Thursday with mostly sunny skies and high temperatures in the upper 70s to low 80s. Friday will be sunny and breezy with highs in the upper 70s to low 80s. A cold front is expected to traverse the High Plains Friday evening, supporting a slight chance for isolated evening storms. Looking ahead to the weekend, skies will be sunny with highs in the mid to upper 70s. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (25%) NONE Arapahoe 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (25%) NONE Boulder 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (25%) NONE Broomfield 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (25%) NONE Denver 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (25%) NONE Douglas 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (25%) NONE Jefferson 400 PM TO 900 PM 0.05" (75%) to 0.1" (50%) to 0.15" (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. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]