Time: 935 PM Fri July 14, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT Message 1’s have been issued for the entire District and will be valid until 1:00 AM Saturday. A boundary has moved in from the N/NE and has sparked late evening thunderstorms which may become more numerous over the next few hours. Relatively fast storm motions will help to reduce point rainfall amounts from a single storm with training of thunderstorm cells possibly producing periods of heavy rainfall that may result in excessive runoff. Thunderstorms will generally move from WNW to ESE at 20-25mph with stronger storms potentially moving more slowly. Strong thunderstorms may also contain hail, gusty winds as well as brief heavy rainfall. Best chances for storms will be over the next 2-3 hours, most likely favoring areas along and E of I-25. STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.5-1.2” in 10-30 minutes. WORST CASE SCENARIO: Training of thunderstorm cells may produce heavy rainfall of up to 2.0” in 60-75 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Jefferson County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Broomfield County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Douglas County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Adams County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Denver County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY DIA 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Arapahoe County 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY the City of Aurora 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Arvada 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Wheat Ridge 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY Lakewood 1 Current TO 100 AM SATURDAY Current TO 1200 AM SATURDAY County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 100 AM SAT 0.1" (90%) to 0.5" (50%) to 1" (25%) ISSUED Arapahoe Current TO 100 AM SAT 0.1" (90%) to 0.5" (50%) to 1" (25%) ISSUED Boulder Current TO 100 AM SAT 0.1" (75%) to 0.5" (30%) to 1" (10%) ISSUED Broomfield Current TO 100 AM SAT 0.1" (75%) to 0.5" (30%) to 1" (10%) ISSUED Denver Current TO 100 AM SAT 0.1" (80%) to 0.5" (40%) to 1" (20%) ISSUED Douglas Current TO 100 AM SAT 0.1" (80%) to 0.5" (40%) to 1" (20%) ISSUED Jefferson Current TO 100 AM SAT 0.1" (80%) to 0.5" (40%) to 1" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 100 AM SAT 0.1" (75%) to 0.5" (30%) to 1" (10%) ISSUED Douglas Current TO 100 AM SAT 0.1" (75%) to 0.5" (30%) to 1" (10%) ISSUED Jefferson Current TO 100 AM SAT 0.1" (75%) to 0.5" (30%) to 1" (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]