Flash Flood Prediction Program

Time: 908 AM Thu July 13, 2023 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- HOT SUMMERTIME CONDITIONS WITH ISOLATED AFTERNOON THUNDERSTORMS High pressure ridging over the Desert Southwest will support hot summertime conditions today followed by a frontal passage tonight. Today will be sunny with high temperatures climbing into the low to mid 90s, dew points in the upper 40s to around 50°F. Dry conditions are generally favored throughout the morning, followed by isolated showers and thunderstorms through the afternoon and evening. Overnight, a cool front will sweep across the High Plains, supporting cooler temperatures and a modest increase in moisture. STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms have the potential to produce moderate rainfall of up to 0.25” in 10-30 minutes. Strong thunderstorms have the potential to produce heavy rainfall up to 0.50” in 10-30 minutes. WORST CASE SCENARIO: Training or anchored thunderstorms have the potential to produce 0.50” to 1.00” in 60 minutes. A LOOK AHEAD: Friday will be warm with afternoon temperatures in the mid to upper 80s and a chance for isolated showers and thunderstorms. Saturday will be similar, with highs in the low to mid 80s and afternoon thunderstorm activity. Warmer and drier weather will build into the region beginning Sunday. Afternoon temperatures will climb into the upper 80s to low 90s under clear and sunny skies. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Arapahoe 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Boulder 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Broomfield 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Denver 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Douglas 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Jefferson 200 PM TO 800 PM Trace (90%) to 0.25" (50%) to 0.5" (10%) LOW Foothills above 6500ft       Boulder 200 PM TO 800 PM Trace (90%) to 0.25" (60%) to 0.5" (30%) LOW Douglas 200 PM TO 800 PM Trace (90%) to 0.25" (60%) to 0.5" (30%) LOW Jefferson 200 PM TO 800 PM Trace (90%) to 0.25" (60%) to 0.5" (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]