Flash Flood Prediction Program

Time: 824 PM Thu September 14, 2023 Forecaster: Laura Smith ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 9:00 PM Message 1’s will be allowed to expire at 9pm as the threat of heavy rain has come to an end. Stronger storms that impacted the District this afternoon have moved east at this time, with light showers lingering across the foothills. Light to moderate intermittent showers are possible throughout the evening and overnight hours, with overnight temperatures in the upper 40s to low 50s. STORM RAINFALL POTENTIAL AND DURATION: Stratified rainfall will continue overnight, producing a trace to 0.20” total in 10-30 minutes. WORST CASE SCENARIO: Moderate showers could produce 0.20”-0.40” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 900 PM Current TO 830 PM Jefferson County 1 Current TO 900 PM Current TO 830 PM Broomfield County 1 Current TO 900 PM Current TO 830 PM Douglas County 1 Current TO 900 PM Current TO 830 PM Adams County 1 Current TO 900 PM Current TO 830 PM Denver County 1 Current TO 900 PM Current TO 830 PM DIA 1 Current TO 900 PM Current TO 830 PM Arapahoe County 1 Current TO 900 PM Current TO 830 PM the City of Aurora 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 Lakewood 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 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Arapahoe Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Boulder Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Broomfield Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Denver Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Douglas Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Jefferson Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Foothills above 6500ft       Boulder Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Douglas Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) NONE Jefferson Current TO 400 AM FRI Trace (75%) to 0.2" (50%) to 0.4" (25%) 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]