Time: 1033 PM Wed July 26, 2023 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- RAIN SHOWERS AND POSSIBLY A WEAK THUNDERSTORM OR TWO LIEKLY THROUGH MIDNIGHT AND BEYOND An additional round of widely scattered rain showers and isolated weak thunderstorms has developed and will be passing through the District late this evening. Showers are fast moving, and heavy rainfall is not expected to occur, but a few areas may experience a brief burst of moderate rain under weak thunderstorms, rainfall amounts will generally remain under 0.2” with isolated higher amounts possible. Just enough rain to produce some minor runoff in the gutters for most regions. The back edge of the showers are 2-3 hours out and then completely dry conditions are expected for the remainder of the evening and overnight period. If a stronger thunderstorm is able to develop a brief burst of heavy rainfall may occur but the chances are minimal and will be very isolated. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.1" of precipitation. Weak thunderstorms may result in rainfall rates of 0.1-0.3" of rain in 10-30 minutes. WORST CASE SCENARIO: Although unlikely if a stronger thunderstorm is able to develop rainfall rates of 0.3-0.8" of rain possible in 10-30 minutes. A LOOK AHEAD: Isolated to widely scattered thunderstorms are expected again on Thursday some of which may produce brief heavy rainfall, hail and gusty winds in the afternoon and evening. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Arapahoe Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Boulder Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Broomfield Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Denver Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Douglas Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Jefferson Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Foothills above 6500ft       Boulder Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Douglas Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) NONE Jefferson Current TO 200 AM THU Trace (90%) to 0.1" (60%) to 0.3" (20%) 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]