Flash Flood Prediction Program

Time: 1100 PM Thu June 15, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 1159PM Message 1’s will be allowed to expire at 11:59pm as the threat of heavy rainfall has come to an end. Widespread showers still persist over the District at this time and will continue over the next few hours as they slowly progress eastward. A couple pockets of moderate rainfall will be possible with these showers, favoring southern portions of the District currently. A few off and on showers will be likely through the overnight and into tomorrow. Overnight lows will drop into the low 50’s on the plains with mid to upper 40’s along the foothills. A stronger disturbance moves over the region tomorrow, bringing another good chance for widespread heavy rainfall tomorrow, with the best chance currently starting as early as 11am tomorrow morning. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace to 0.20” total, in 10-30 minutes. A weak to moderate thunderstorm will produce 0.20-0.40” total in 10-30 minutes. WORST CASE SCENARIO: A stronger thunderstorm, or training of moderate showers/thunderstorms will have the potential to produce 0.8” total in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 Current TO 1159 PM Current TO 1130 PM Arapahoe County 1 Current TO 1159 PM Current TO 1130 PM Denver County 1 Current TO 1159 PM Current TO 1130 PM DIA 1 Current TO 1159 PM Current TO 1130 PM Adams County 1 Current TO 1159 PM Current TO 1130 PM Douglas County 1 Current TO 1159 PM Current TO 1130 PM Broomfield County 1 Current TO 1159 PM Current TO 1130 PM Jefferson County 1 Current TO 1159 PM Current TO 1130 PM Boulder County 1 Current TO 1159 PM Current TO 1130 PM Arvada 1 Current TO 1159 PM Current TO 1130 PM Wheat Ridge 1 Current TO 1159 PM Current TO 1130 PM Lakewood 1 Current TO 1159 PM Current TO 1130 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 600 AM FRI Trace (80%) to 0.2" (40%) to 0.4" (20%) NONE Arapahoe Current TO 600 AM FRI Trace (80%) to 0.2" (40%) to 0.4" (20%) NONE Boulder Current TO 600 AM FRI Trace (80%) to 0.2" (40%) to 0.4" (20%) NONE Broomfield Current TO 600 AM FRI Trace (80%) to 0.2" (40%) to 0.4" (20%) NONE Denver Current TO 600 AM FRI Trace (80%) to 0.2" (40%) to 0.4" (20%) NONE Douglas Current TO 600 AM FRI Trace (80%) to 0.2" (40%) to 0.4" (20%) NONE Jefferson Current TO 600 AM FRI Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Foothills above 6500ft       Boulder Current TO 600 AM FRI Trace (50%) to 0.2" (30%) to 0.4" (15%) NONE Douglas Current TO 600 AM FRI Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Jefferson Current TO 600 AM FRI Trace (40%) to 0.2" (20%) to 0.4" (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]