Flash Flood Prediction Program

Time: 548 PM Fri May 26, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S HAVE BEEN RESCINDED/HEAVY RAINFALL THREAT HAS ENDED FOR TODAY Message 1’s have been rescinded (Message 4 issued) as the threat for heavy rainfall has ended for the day. Thunderstorm activity has pushed east of the District and a more stable air mass is now in place and strong thunderstorms are no longer expected. There could be a few additional rain showers and possibly a very isolated weak thunderstorm this evening, but additional shower activity will only produce minor additional rainfall amounts. Best chances for additional showers will be over the foothills into the evening with dry conditions ahead of midnight. A down-tick in thunderstorm activity is expected on Saturday but there will still be afternoon thunderstorms with the potential to produce heavy rainfall but the areal coverage of storms will likely be less than today. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and possibly a weak thunderstorm will produce rainfall amounts of trace to 0.2" in 10-30 minutes. WORST CASE SCENARIO: A very isolated moderate thunderstorm is able to develop with the potential to produce rainfall rates of 0.2-0.6" in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Arapahoe Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Boulder Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Broomfield Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Denver Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Douglas Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Jefferson Current TO 1100 PM FRI Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Foothills above 6500ft       Boulder Current TO 1100 PM FRI Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas Current TO 1100 PM FRI Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Jefferson Current TO 1100 PM FRI Trace (40%) to 0.1" (20%) to 0.2" (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]