Time: 947 AM Fri August 26, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- SEASONAL TEMPERATURES WITH WIDELY SCATTERED AFTERNOON THUNDERSTORMS - Trough of low pressure overhead will sag southward during the day and result in widely scattered afternoon thunderstorms over the District. Temperatures will warm into the mid and upper 80's over the plains with 70's in the Front Range foothills. Normal high for Denver today is 86 degrees. - Showers and weak to moderate thunderstorms will develop over the foothills by early afternoon then spread out onto the plains between 1-3pm. Generally one round of showers/thunderstorms is expected over the plains with conditions drying out between 6-8pm. Thunderstorms will likely be more numerous W of I-25 and S of I-70. Storm motions will be from W to E at around 15mph. - Thunderstorms are expected to be weak to moderate in intensity producing mainly light to brief moderate rain. A stronger storm cannot be completely ruled out and will have the potential for brief heavy rainfall. After sunset conditions will dry out and remain dry for the remainder of the evening and overnight period. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.2" of rain. A moderate thunderstorm will have the potential to produce rainfall rates of 0.2-0.5" in 10-30 minutes. WORST CASE SCENARIO: A slow moving strong thunderstorm is able to develop with the potential to produce rainfall amounts of 0.4-0.9" in 10-30 minutes. A LOOK AHEAD: Drier air will move into the District on Saturday and result in generally dry conditions over the plains with a few isolated storms possible over the foothills and Palmer Divide. Temperatures will tack on a degree or two with highs over the plains in the upper 80's to around 90 degrees. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 700 PM Trace (70%) to 0.2" (40%) to 0.5" (10%) LOW Arapahoe 200 PM TO 700 PM Trace (80%) to 0.2" (50%) to 0.5" (15%) LOW Boulder 200 PM TO 700 PM Trace (75%) to 0.2" (50%) to 0.5" (10%) LOW Broomfield 200 PM TO 700 PM Trace (75%) to 0.2" (50%) to 0.5" (10%) LOW Denver 200 PM TO 700 PM Trace (75%) to 0.2" (50%) to 0.5" (10%) LOW Douglas 200 PM TO 700 PM Trace (85%) to 0.2" (50%) to 0.5" (15%) LOW Jefferson 200 PM TO 700 PM Trace (75%) to 0.2" (50%) to 0.5" (10%) LOW Foothills above 6500ft       Boulder 100 PM TO 700 PM Trace (90%) to 0.2" (60%) to 0.5" (20%) LOW Douglas 100 PM TO 700 PM Trace (90%) to 0.2" (60%) to 0.5" (20%) LOW Jefferson 100 PM TO 700 PM Trace (90%) to 0.2" (60%) to 0.5" (20%) 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]