Flash Flood Prediction Program

Time: 937 AM Thu June 23, 2022 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- WARM WITH ISOLATED AFTERNOON/EARLY EVE RAIN SHOWERS/THUNDERSTORMS - Mid level moisture advection from the Pacific will create conditions for light to moderate rainfall this afternoon and early evening. Current temperatures are in the low to mid 70's across the District and will continue to climb into the upper 80's to low 90's by this afternoon. - A round of scattered afternoon showers and thunderstorms is expected primarily across the foothills and Palmer Divide today. There is a slight chance an isolated shower or two rolls off the foothills and into the District between 3pm to 7pm. - By sunset, rain shower activity will decrease with skies clearing through the overnight hours. Overnight lows will drop into the low 60's on the plains with upper 40's across the foothills. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.2" in 30-60 minutes. WORST CASE SCENARIO: A stronger thunderstorm or training of thunderstorm cells may result in up to 0.2" of rainfall in 10-30 minutes. A LOOK AHEAD: Tomorrow, highs will reach the upper 80's to low 90's with scattered afternoon thunderstorms. A cool front will sweep across the plains overnight on Friday, positioning a cooler airmass over the state. High temperatures on Saturday will reach the upper 70's to low 80's as cloud cover increases throughout the day. Widespread showers and thunderstorms will begin to develop Saturday afternoon, persisting into the evening. Light rain showers may linger overnight and into Sunday morning. The Front Range Urban Corridor will continue cooling on Sunday, with highs in the mid 70's with showers and thunderstorms through the overnight hours. LOCATION PRIME TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams 300 PM TO 700 PM Trace (30%) to 0.1" (20%) to 0.2" (10%) NONE Arapahoe 300 PM TO 700 PM Trace (30%) to 0.1" (20%) to 0.2" (10%) NONE Broomfield 300 PM TO 700 PM Trace (30%) to 0.1" (20%) to 0.2" (10%) NONE Denver 300 PM TO 700 PM Trace (30%) to 0.1" (20%) to 0.2" (10%) NONE Douglas 300 PM TO 700 PM Trace (30%) to 0.1" (20%) to 0.2" (10%) NONE Boulder 100 PM TO 900 PM Trace (40%) to 0.1" (30%) to 0.2" (10%) NONE Jefferson 100 PM TO 900 PM Trace (40%) to 0.1" (30%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder 100 PM TO 900 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas 100 PM TO 900 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Jefferson 100 PM TO 900 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) 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]