Time: 919 AM Tue September 20, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- ONE MORE WARM AND DRY DAY OVER THE DISTRICT TODAY/CLOUDY, COOL AND WET ON WEDNESDAY - Conditions will be dry over the District for one more day with temperatures continuing to run well above seasonal averages. Highs this afternoon will reach the upper 80's to lower 90's over the plains with 70's and 80's in the Front Range foothills. Normal high for Denver today is 78 degrees and the record high is 94 degrees. - SW flow aloft will be increasing mid and upper level moisture as the day progresses with showers and thunderstorms forming over western Colorado and the mountainous areas of the state. Areas E of the Continental Divide including the District are expected to remain on the dry side until a cold front moves through later this evening. - Behind the front chances for light rain showers will be increasing overnight into Wednesday morning. Minimal moisture is expected overnight with more significant shower activity filling in ahead of noon on Wednesday. Overnight lows will dip into the 50's over the plains with some 40's in the foothills. STORM RAINFALL POTENTIAL AND DURATION: Rain showers overnight will produce rainfall rates of a trace to 0.2" in 60 minutes. A LOOK AHEAD: Much cooler and cloudy Wednesday with highs only in the 50's to lower 60's. Rain showers will increase Wednesday morning with prime time for measurable rain from about 10am or noon Wednesday through daybreak Thursday. Typical rainfall amounts expected to be in the 0.25-0.75" range with higher amounts possible. The cooler temperatures should lead to a stratiform rain event versus a convective thunderstorm environment resulting in generally light to moderate rain. If thunderstorms are able to develop heavy rainfall will be possible. LOCATION PRIME TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Arapahoe 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Boulder 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Broomfield 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Denver 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Douglas 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Jefferson 1100 PM TO 1000 AM WED Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder 1100 PM TO 1000 AM WED Trace (80%) to 0.1" (40%) to 0.2" (15%) NONE Douglas 1100 PM TO 1000 AM WED Trace (80%) to 0.1" (40%) to 0.2" (15%) NONE Jefferson 1100 PM TO 1000 AM WED Trace (80%) to 0.1" (40%) 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]