Flash Flood Prediction Program

Time: 1044 PM Sun May 30, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 11:00 PM - Message 1's will be allowed to expire at 11:00pm as the threat for heavy rain has come to an end. - A few lingering scattered rain showers persist over the District and will continue off and on through the overnight and into Monday morning. Rain showers will typically be a drizzle to mist with a generally a trace-0.10", with the occasional pockets of light to moderate rainfall between 0.1-0.3". Best chance for additional rainfall will be from now until 2:00am with chances decreasing into daybreak Monday. - Overnight lows will drop into the mid to upper 40's on the plains with around 40 along the foothills. Relative humidity will remain at or close to 100% through the overnight and into daybreak Monday resulting in areas of fog/mist/drizzle through tomorrow morning. Cool and cloudy to start the day tomorrow with another good chance for rain showers and isolated thunderstorms. STORM RAINFALL POTENTIAL AND DURATION: Typical light rain showers will produce a TR-0.1" in 10-30 minutes. A moderate rain shower will produce 0.1-0.3" in 10-30 minutes. WORST CASE SCENARIO: A moderate thunderstorms has the potential to produce 0.3-0.8" in 60- 90minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1100 PM Current TO 1100 PM Jefferson County 1 Current TO 1100 PM Current TO 1100 PM Broomfield County 1 Current TO 1100 PM Current TO 1100 PM Douglas County 1 Current TO 1100 PM Current TO 1100 PM Adams County 1 Current TO 1100 PM Current TO 1100 PM Denver County 1 Current TO 1100 PM Current TO 1100 PM DIA 1 Current TO 1100 PM Current TO 1100 PM Arapahoe County 1 Current TO 1100 PM Current TO 1100 PM the City of Aurora 1 Current TO 1100 PM Current TO 1100 PM Arvada 1 Current TO 1100 PM Current TO 1100 PM Wheat Ridge 1 Current TO 1100 PM Current TO 1100 PM Lakewood 1 Current TO 1100 PM Current TO 1100 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Arapahoe Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Boulder Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Broomfield Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Denver Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Douglas Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Jefferson Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Douglas Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (10%) ISSUED Jefferson Current TO 800 AM MON Trace (75%) to 0.1" (30%) to 0.3" (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]