Time: 626 PM Sat June 29, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGES 1’S HAVE BEEN ISSUED EFFECTIVE Until 9:00 PM Message 1’s have been issued for the entire District effective until 9:00pm this evening. A round of storms have moved into the District bringing isolated moderate to heavy rainfall with 0.20”-0.25” in 5-10min out of some cells. These storms will continue to impact the District over the next few hours, with a few lingering showers possible through midnight. Storms will generally move from west to east between 10-20mph, however, gust front have caused a few storms to become stationary, and these storms will provide the largest threat for moderate to brief heavy rainfall. Storms may also contain gusty winds and frequent cloud-to-ground lightning. The largest threat will be a quick 0.50” in 10-30 minutes rather than any long lasting rain. Storms should weaken in intensity behind this first round with off and on showers possible until midnight. Overnight will be partly cloudy with low temperatures dropping into the low 60s on the plains with mid to upper 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers/thunderstorms today will produce a trace to 0.30" total in 10-30 minutes. Moderate to strong thunderstorms will produce up to 0.30-0.60” in 10-30 minutes. WORST CASE SCENARIO: Stationary thunderstorms, or training of thunderstorm cells have the potential to produce up to 1.20” total in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 Current TO 900 PM Current TO 830 PM Arapahoe County 1 Current TO 900 PM Current TO 830 PM DIA 1 Current TO 900 PM Current TO 830 PM Denver County 1 Current TO 900 PM Current TO 830 PM Adams County 1 Current TO 900 PM Current TO 830 PM Douglas County 1 Current TO 900 PM Current TO 830 PM Broomfield County 1 Current TO 900 PM Current TO 830 PM Jefferson County 1 Current TO 900 PM Current TO 830 PM Boulder County 1 Current TO 900 PM Current TO 830 PM Lakewood 1 Current TO 900 PM Current TO 830 PM Arvada 1 Current TO 900 PM Current TO 830 PM Wheat Ridge 1 Current TO 900 PM Current TO 830 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM SAT Trace (80%) to 0.25" (60%) to 0.5" (40%) ISSUED Arapahoe Current TO 1159 PM SAT Trace (80%) to 0.25" (60%) to 0.5" (40%) ISSUED Boulder Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (20%) ISSUED Broomfield Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (20%) ISSUED Denver Current TO 1159 PM SAT Trace (80%) to 0.25" (60%) to 0.5" (40%) ISSUED Douglas Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (20%) ISSUED Jefferson Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (20%) ISSUED Douglas Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (20%) ISSUED Jefferson Current TO 1159 PM SAT Trace (80%) to 0.25" (40%) to 0.5" (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]