Time: 939 AM Sat June 22, 2024 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Slight changes for isolated afternoon showers Sufficient moisture and a small disturbance will provide forcing for afternoon thunderstorms today. Afternoon temperatures will be in the low 90s, dewpoints in around 40°F, with precipitable water (PWAT) values around 0.70”. Today's storms will be high-based and relatively fast-moving. Widespread convective initiation will begin over the mountains and foothills around lunchtime, but the storms that reach the urban corridor are likely to be isolated and subject to evaporative cooling processes that make measurable precipitation scarce. Storms that do spill off the mountains will do so between 2PM-10PM, clearing out overnight and leaving behind clear skies. STORM RAINFALL POTENTIAL AND DURATION: Thunderstorms today have the potential to produce up to 0.10” in 10-30 minutes. WORST CASE SCENARIO: Strong thunderstorms may be capable of producing 0.25” 30 minutes or less. A LOOK AHEAD: The following days will all look like today as the ridge settles in, with daily highs climbing into the mid to upper 90s. Mostly sunny and dry conditions are expected through the weekend. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Arapahoe 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Boulder 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Broomfield 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Denver 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Douglas 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Jefferson 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Foothills above 6500ft       Boulder 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Douglas 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) NONE Jefferson 200 PM TO 1000 PM Trace (20%) to 0.05" (15%) to 0.1" (10%) 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]