Time: 1210 PM Sun June 30, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGES 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 10:00 PM Message 1’s have been issued for the entire District effective until 10:00pm this evening. Storms have started to initiate to the west already today and will likely continue into the afternoon with a couple of rounds of showers/thunderstorms possible for the District today. Elevated dew points, currently in the upper 50s to nearly 60 will result in efficient rainfall producing storms this afternoon and evening with a good chance for moderate to heavy rainfall for some locations leading to localized flooding. This initial round of storms will meander into the District over the next hour or so, with additional showers and thunderstorms likely forming along outflow boundaries into the afternoon. Storm motions will generally be west to east around 10mph, however, storms formed along outflow boundaries will have the largest potential for heavy rainfall as they tend to anchor in place for extended periods. Storms today may also contain gusty winds up to 60mph and hail up to 1.0” resulting in a LOW chance for severe weather, likely favoring eastern portions of the District. There will be an additional round of showers and thunderstorms later this evening, similar to yesterday between 7-10pm. Due to excess moisture in place, and good upper-level support, there will be a continued chance for moderate to heavy rainfall into the late evening hours. A few off and on showers will be possible overnight, although the threat of heavy rainfall should diminish after 10pm. Overnight will be cloudy as low temperatures drop into the low 60s on the plains. STORM RAINFALL POTENTIAL AND DURATION: Typical showers/thunderstorms today will produce 0.10-0.50" total in 10-30 minutes. Moderate to strong thunderstorms will produce up to 0.50-1.00” total in 10-30 minutes. WORST CASE SCENARIO: Stationary thunderstorms, or training of thunderstorm cells have the potential to produce up to 2.00” total in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Jefferson County 1 Current TO 1000 PM Current TO 930 PM Boulder County 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Denver County 1 Current TO 1000 PM Current TO 930 PM Adams County 1 Current TO 1000 PM Current TO 930 PM Douglas County 1 Current TO 1000 PM Current TO 930 PM Broomfield County 1 Current TO 1000 PM Current TO 930 PM Lakewood 1 Current TO 1000 PM Current TO 930 PM Arvada 1 Current TO 1000 PM Current TO 930 PM Wheat Ridge 1 Current TO 1000 PM Current TO 930 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM SUN 0.1" (75%) to 0.5" (50%) to 1" (25%) ISSUED Arapahoe Current TO 1000 PM SUN 0.1" (75%) to 0.5" (50%) to 1" (25%) ISSUED Boulder Current TO 1000 PM SUN 0.1" (60%) to 0.5" (40%) to 1" (20%) ISSUED Broomfield Current TO 1000 PM SUN 0.1" (60%) to 0.5" (40%) to 1" (20%) ISSUED Denver Current TO 1000 PM SUN 0.1" (75%) to 0.5" (50%) to 1" (25%) ISSUED Douglas Current TO 1000 PM SUN 0.1" (75%) to 0.5" (50%) to 1" (25%) ISSUED Jefferson Current TO 1000 PM SUN 0.1" (60%) to 0.5" (40%) to 1" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM SUN 0.1" (60%) to 0.5" (40%) to 1" (20%) ISSUED Douglas Current TO 1000 PM SUN 0.1" (60%) to 0.5" (40%) to 1" (20%) ISSUED Jefferson Current TO 1000 PM SUN 0.1" (60%) to 0.5" (40%) to 1" (20%) ISSUED MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]