Time: 854 AM Sun July 25, 2021 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- SEASONAL TEMPERATURES WITH LATE AFTERNOON AND EVENING SHOWER/THUNDERSTORM ACTIVITY - The haze has become a daily norm and will continue today with seasonal temperatures. Highs this afternoon over the plains will reach either side of 90 degrees with 70's and lower 80's in the Front Range foothills. Normal high for Denver today is 90 degrees. - Moisture has decreased from this time yesterday but enough lingers to produce widely scattered rain showers and weak to moderate thunderstorms this afternoon and evening. The initiation for showers and thunderstorms looks to be delayed over the plains but could go late into the evening. Showers and thunderstorms will develop over the foothills between 1-3pm with chances increasing over the plains between 3-6pm. Best chances for shower and thunderstorm activity will continue through 10pm with lingering showers possible until about midnight. - Thunderstorms are expected to be weak to moderate in intensity but if a strong thunderstorm is able to develop it will be capable of producing brief heavy rainfall. Relatively slow storm motions from NW to SE this afternoon and the slight threat for an isolated stronger storm will keep a low Message potential in the cards today. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.2" in 30 minutes or less. Weak to moderate thunderstorms will have the potential to produce moderate rain fall of 0.2-0.6" in 10-30 minutes. WORST CASE SCENARIO: A slow moving strong thunderstorm is able to develop with the potential to produce 0.4-1.2" of heavy rain in 10-30 minutes. A LOOK AHEAD: Thunderstorm activity will favor the higher terrain on Monday with the plains looking to experience minimal if any storm activity. Temperatures will tack on 2-3 degrees all areas. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 400 PM TO 1000 PM Trace (80%) to 0.2" (60%) to 0.6" (20%) LOW Arapahoe 400 PM TO 1000 PM Trace (90%) to 0.2" (60%) to 0.6" (25%) LOW Broomfield 400 PM TO 1000 PM Trace (80%) to 0.2" (60%) to 0.6" (20%) LOW Denver 400 PM TO 1000 PM Trace (90%) to 0.2" (60%) to 0.6" (25%) LOW Boulder 300 PM TO 1000 PM Trace (80%) to 0.2" (60%) to 0.6" (20%) LOW Douglas 300 PM TO 1000 PM Trace (80%) to 0.2" (60%) to 0.6" (25%) LOW Jefferson 300 PM TO 1000 PM Trace (90%) to 0.2" (60%) to 0.6" (25%) LOW Foothills above 6500ft       Boulder 100 PM TO 1000 PM Trace (90%) to 0.2" (60%) to 0.6" (30%) LOW Douglas 100 PM TO 1000 PM Trace (90%) to 0.2" (60%) to 0.6" (30%) LOW Jefferson 100 PM TO 1000 PM Trace (90%) to 0.2" (60%) to 0.6" (30%) LOW MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]