Flash Flood Prediction Program

Time: 636 PM Sat June 25, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- TOO COOL FOR THUNDERSTORMS TODAY WITH CHANCES FOR RAIN SHOWERS OVERNIGHT - Temperatures remained too cool over the District to initiate thunderstorms this afternoon with the majority of the activity remaining well to the S and W over Clear Creek, Park, Teller and El Paso Counties. Widely scattered rain showers and possibly a weak thunderstorm or two are still expected to develop as the evening wears on with lingering light rain showers likely into Sunday morning. - Best chances for precipitation through midnight will be W of I-25 and S of I-70. After midnight better chances spread out onto the plains for experiencing light rain showers into Sunday morning. The potential for heavy rainfall has diminished for the remainder of the evening and overnight period. - Total rainfall amounts overnight expected to be minor, between a TR-0.2" over the majority of the District with isolated higher amounts over the foothills and Palmer Divide. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.1" in 10-30 minutes. A weak thunderstorm will have the potential to produce rainfall rates of 0.1-0.3" in 10-30 minutes. WORST CASE SCENARIO: A moderate to briefly strong thunderstorm is able to develop with the potential to produce brief heavy rainfall of 0.3-0.9" in 10-30 minutes. A LOOK AHEAD: Temperatures will struggle to make it much above 70 degrees over the plains on Sunday. The unseasonably cool temperatures and cloud cover at times will likely result in the majority of the thunderstorm activity over the higher terrain again tomorrow. Should thunderstorms be able to develop over the plains they will be capable of producing heavy rainfall. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 800 PM TO 1000 AM SUN Trace (80%) to 0.1" (40%) to 0.3" (20%) NONE Arapahoe 800 PM TO 1000 AM SUN Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Broomfield 800 PM TO 1000 AM SUN Trace (80%) to 0.1" (40%) to 0.3" (20%) NONE Denver 800 PM TO 1000 AM SUN Trace (85%) to 0.1" (50%) to 0.3" (20%) NONE Boulder Current TO 1000 AM SUN Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Douglas Current TO 1000 AM SUN Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Jefferson Current TO 1000 AM SUN Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Foothills above 6500ft       Boulder Current TO 1000 AM SUN Trace (100%) to 0.1" (75%) to 0.3" (40%) NONE Douglas Current TO 1000 AM SUN Trace (100%) to 0.1" (75%) to 0.3" (40%) NONE Jefferson Current TO 1000 AM SUN Trace (100%) to 0.1" (75%) to 0.3" (40%) 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]