Time: 900 AM Sat June 4, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- WARMING UP WITH ISOLATED AFTERNOON THUNDERSTORMS - Westerly flow aloft will import warmer and drier air into the District today allowing temperatures to climb well into the 80's over the plains with 70's in the Front Range foothills. Normal high for Denver today is 79 degrees. - Daytime heating and surface moisture will result in a build up of clouds this afternoon making for partly to mostly cloudy skies at times and introducing a slight chance for isolated thunderstorms from early afternoon to sunset. Moisture is more limited today and the storms that manage to develop this afternoon will be weak producing minimal rainfall and breezy winds. Most areas within the District will end up on the drier side today. - Tonight, cloud cover will decrease with overnight lows dropping into the 50's over the plains with some 40's in the Front Range foothills. Dry conditions will persist overnight into midday Sunday. STORM RAINFALL POTENTIAL AND DURATION: Rain showers or weak thunderstorms will produce a trace to 0.2" of rain in 30 minutes or less. WORST CASE SCENARIO: A moderate to briefly strong thunderstorm is able to develop with the potential to produce rainfall rates of 0.1-0.4" in 10-30 minutes. A LOOK AHEAD: More of the same for Sunday with temperatures warming into the low and mid 80's over the plains with isolated afternoon thunderstorm activity. Much like today storms that develop Sunday will produce minimal rainfall and gusty winds. Better chances for thunderstorms will arrive late afternoon Monday or Monday evening as a weather disturbance moves in from the NW. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 100 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Arapahoe 100 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Boulder 100 PM TO 800 PM Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Broomfield 100 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Denver 100 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas 100 PM TO 800 PM Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Jefferson 100 PM TO 800 PM Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder 1200 PM TO 800 PM Trace (60%) to 0.1" (30%) to 0.2" (15%) NONE Douglas 1200 PM TO 800 PM Trace (60%) to 0.1" (30%) to 0.2" (15%) NONE Jefferson 1200 PM TO 800 PM Trace (60%) to 0.1" (30%) to 0.2" (15%) 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]