Time: 628 PM Wed July 19, 2023 Forecaster: Laura Smith ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 8:00 PM Message 1’s will be allowed to expire at 8:00PM as the threat of heavy rain has come to an end. A few showers and a weak thunderstorm or two will be possible over the next few hours as the tail end of today’s disturbance continues eastward. If any storms develop, they are expected to favor southern portions of the District through 10:00PM. Quick storm motions from west to east, between 25-35 mph will limit any point rainfall amounts. Overnight lows will remain in the low to mid 60’s across most of the District. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace to 0.20” total, in 10-30 minutes. A weak thunderstorm could produce 0.20-0.40” total, in 10-30 minutes. WORST CASE SCENARIO: A moderate to strong thunderstorm has the potential to produce up to 0.80” total, in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 800 PM Current TO 700 PM Jefferson County 1 Current TO 800 PM Current TO 700 PM Broomfield County 1 Current TO 800 PM Current TO 700 PM Douglas County 1 Current TO 800 PM Current TO 700 PM Adams County 1 Current TO 800 PM Current TO 700 PM Denver County 1 Current TO 800 PM Current TO 700 PM DIA 1 Current TO 800 PM Current TO 700 PM Arapahoe County 1 Current TO 800 PM Current TO 700 PM the City of Aurora 1 Current TO 800 PM Current TO 700 PM Arvada 1 Current TO 800 PM Current TO 700 PM Wheat Ridge 1 Current TO 800 PM Current TO 700 PM Lakewood 1 Current TO 800 PM Current TO 700 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM WED Trace (35%) to 0.2" (15%) to 0.4" (5%) NONE Arapahoe Current TO 1000 PM WED Trace (40%) to 0.2" (25%) to 0.4" (10%) NONE Boulder Current TO 1000 PM WED Trace (35%) to 0.2" (15%) to 0.4" (5%) NONE Broomfield Current TO 1000 PM WED Trace (35%) to 0.2" (15%) to 0.4" (5%) NONE Denver Current TO 1000 PM WED Trace (35%) to 0.2" (15%) to 0.4" (5%) NONE Douglas Current TO 1000 PM WED Trace (40%) to 0.2" (25%) to 0.4" (10%) NONE Jefferson Current TO 1000 PM WED Trace (35%) to 0.2" (15%) to 0.4" (5%) NONE Foothills above 6500ft       Boulder Current TO 1000 PM WED Trace (40%) to 0.2" (25%) to 0.4" (10%) NONE Douglas Current TO 1000 PM WED Trace (40%) to 0.2" (25%) to 0.4" (10%) NONE Jefferson Current TO 1000 PM WED Trace (40%) to 0.2" (25%) 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]