Flash Flood Prediction Program

Time: 931 PM Sat July 8, 2023 Forecaster: Laura Smith ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 10:00 PM Message 1’s will be allowed to expire at 10:00PM 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 eastern portions of the District through 2:00AM. Quick storm motions from northwest to southeast, between 25-35 mph will limit any point rainfall amounts. Overnight lows will remain in the mid to upper 50’s across most of the District. Warmer daytime temperatures are expected tomorrow as high pressure ridging expands across the Desert Southwest with only a slight chance for showers and thunderstorms Sunday. 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 1000 PM Current TO 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 600 AM SUN Trace (25%) to 0.2" (20%) to 0.4" (15%) NONE Arapahoe Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Boulder Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Broomfield Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Denver Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Douglas Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Jefferson Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Foothills above 6500ft       Boulder Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Douglas Current TO 600 AM SUN Trace (20%) to 0.2" (15%) to 0.4" (10%) NONE Jefferson Current TO 600 AM SUN Trace (20%) to 0.2" (15%) 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]