Time: 610 PM Sat June 3, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S HAVE BEEN RESCINDED (MESSAGE 4'S ISSUED) Message 1’s have been rescinded as the threat of heavy rain has come to an end. A very unusual weather pattern is in place resulting in atypical storm behavior today. These rain showers have not only moved into the region from the east/southeast, but they have also been very efficient rain producing storms. Currently, most, if not all storm activity has subsided in the District and will likely continue through the evening with just isolated light shower activity expected. Another surge of moisture is expected to return late this evening, between 10pm-2am bringing a chance for additional rain showers. These showers will also move into the region from the east, with training of showers possible if they develop. With dew points still in the upper 40’s to low 50’s currently, combined with slow storm movements, there will be at least a LOW chance for Message 1’s to be reissued late this evening, through the overnight and into Sunday morning. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce 0.1-0.3” in 10-30 minutes. A weak to moderate thunderstorm will produce 0.3-0.7” in 10-30 minutes. WORST CASE SCENARIO: A stationary thunderstorm, or training of thunderstorm cells will have the potential to produce 1.4" in under 60 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 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Arapahoe Current TO 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Boulder Current TO 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Broomfield Current TO 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Denver Current TO 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Douglas Current TO 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Jefferson Current TO 600 AM SUN 0.1" (50%) to 0.3" (25%) to 0.7" (10%) LOW Foothills above 6500ft       Boulder Current TO 600 AM SUN 0.1" (60%) to 0.3" (30%) to 0.7" (10%) LOW Douglas Current TO 600 AM SUN 0.1" (40%) to 0.3" (20%) to 0.7" (10%) LOW Jefferson Current TO 600 AM SUN 0.1" (60%) to 0.3" (30%) to 0.7" (10%) 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]