Flash Flood Prediction Program

Time: 905 AM Wed June 2, 2021 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- WARM AND SUNNY WITH A FEW ISOLATED FOOTHILLS RAIN SHOWERS/THUNDERSTORMS - High-pressure will start to build today leading to generally dry conditions with a very slight chance for some isolated rain showers/thunderstorms along the foothills. High temperatures this afternoon will reach the mid to upper 70's on the plains with low 70's along the foothills. - A few isolated rain showers/thunderstorms will initiate along the Continental Divide around midday, with a few of those storms moving eastward and onto the foothills this afternoon. N/NW winds aloft should help limit any storms from moving onto the plains as most storms will keep anchored to the higher terrain. Best chance for storms will be from 1-5pm with conditions drying out into the evening as skies clear into the overnight. - Overnight will be mild, with temperatures dropping into the low 50's. STORM RAINFALL POTENTIAL AND DURATION: Typical foothill rain showers will produce a trace-0.1" in 10-30 minutes. A weak thunderstorm will produce 0.1-0.2" in 10-30 minutes. WORST CASE SCENARIO: An anchored foothill rain shower or moderate thunderstorm could produce 0.2-0.5" in 45-60 minutes. A LOOK AHEAD: High-pressure will hold through the rest of the week with generally dry conditions although a few high-based storms with minimal precipitation cannot be completely ruled out. High temperatures will only increase through the weekend with 80's expected Thursday/Friday with highs around 90 degrees for Saturday. Saturday will also bring a chance for afternoon rain showers/thunderstorms although the threat for heavy rainfall looks minimal at this time. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Arapahoe 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Boulder 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Broomfield 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Denver 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Douglas 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Jefferson 200 PM TO 600 PM Trace (5%) to 0.1" (0%) NONE Foothills above 6500ft       Boulder 100 PM TO 500 PM Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Douglas 100 PM TO 500 PM Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Jefferson 100 PM TO 500 PM Trace (20%) to 0.1" (10%) to 0.2" (5%) 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]