Time: 736 PM Sat July 8, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN EXTENDED UNTIL 10:00 PM Messages have been extended until 10pm as the threat of heavy rain persists. A gust front from the northeast is approaching the District at this time. This gust has stirred up storms around Greeley and could also initiate storms in the District over the next couple of hours. Storms have not been that strong behind the gust front. However, a pulse up thunderstorm with mid to upper level 50’s dew points could result in a storm with quick 0.5” in 10-20 minutes. Typical storm motions will be from west to east between 10-20mph, although, storms could anchor in place behind this gust front. There is a chance storms do not initiate behind this gust front within the District, and IMS to end Messages earlier than 10pm may be possible this evening. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/weak thunderstorms produce 0.20-0.40” total, in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.2” in 10-30 minutes. WORST CASE SCENARIO: A large thunderstorm or briefly anchored strong thunderstorm may result in up to 2.0" of rain in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME 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 Jefferson County 1 Current TO 1000 PM Current TO 930 PM Boulder County 1 Current TO 1000 PM Current TO 930 PM Denver County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 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 Lakewood 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 SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Arapahoe Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Boulder Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Broomfield Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Denver Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Douglas Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Jefferson Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Douglas Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) ISSUED Jefferson Current TO 1000 PM SAT 0.2" (50%) to 0.4" (25%) to 1.2" (10%) 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]