Time: 846 AM Sun September 22, 2024 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Cool and cloudy with off and on showers persisting this morning. The first day of Fall will be cooler behind a disturbance that moved through the region overnight. Off and on light to briefly moderate showers will persist during the morning hours, clearing out by midday today. Any additional shower activity today will be minimal as rainfall begins to taper off. Skies will gradually clear as this disturbance continues eastward this afternoon. High temperatures today will only reach the upper 50s to around 60 degrees. Conditions will start to dry out this evening with mild and dry conditions expected overnight and into tomorrow. Overnight will be cool as temperatures drop into the upper 30s to low 40s. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace-0.20” total in 10-30 minutes. A moderate shower will produce 0.20”-0.40” total in 10-30 minutes. WORST CASE SCENARIO: A stationary moderate shower or training of moderate to brief heavy showers will have the potential to produce up to 0.80” in under 60 minutes. A LOOK AHEAD: Temperatures bounce back tomorrow, into the mid to upper 70s under mostly sunny skies. Mild and dry conditions are expected throughout most of the day with a slight chance for showers/isolated thunderstorms during the afternoon and early evening hours. Most, if not all shower activity will be limited to the foothills, with a few showers making their way onto the plains. Currently no heavy rainfall is expected during this time with just the typical late fall showers likely before skies gradually clear after sundown. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1200 PM SUN Trace (50%) to 0.2" (25%) to 0.4" (10%) NONE Arapahoe Current TO 1200 PM SUN Trace (50%) to 0.2" (25%) to 0.4" (10%) NONE Boulder Current TO 1200 PM SUN Trace (50%) to 0.2" (25%) to 0.4" (10%) NONE Broomfield Current TO 1200 PM SUN Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Denver Current TO 1200 PM SUN Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Douglas Current TO 1200 PM SUN Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Jefferson Current TO 1200 PM SUN Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Foothills above 6500ft       Boulder Current TO 1200 PM SUN Trace (40%) to 0.2" (20%) to 0.4" (5%) NONE Douglas Current TO 1200 PM SUN Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Jefferson Current TO 1200 PM SUN Trace (30%) to 0.2" (15%) to 0.4" (5%) 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]