Time: 636 AM Fri May 12, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 2'S WILL CONTINUE VALID THROUGH NOON TODAY Message 2's, coinciding with the NWS Flood Watch, will remain in effect until noon today. A Flood Advisory is in effect from NOW through 9am for SE Denver, western Arapahoe County, including Aurora, and all central and eastern Douglas County. Moderate to heavy rainfall overnight has decreased to widespread light to briefly moderate rainfall this morning. However, even non-thunderstorm rain showers this morning, on top of saturated ground is resulting in continued isolated excessive runoff that is producing low end nuisance to moderate flood conditions across the District. Rain showers will continue to be persistent this morning and into the afternoon with typical rainfall rates of 0.1-0.3” in 60 minutes and upwards of 0.3-0.8” in 60 minutes if moderate showers continue over and area for an extended time. Although the intensity of the rain is not heavy compared to yesterday, the overall amount of continuous rain is producing flooding of local creeks and streams, and this will likely remain through the day today. By noon today, showers should start to taper off with any additional rain showers gradually clearing out during the afternoon. Even though rain showers stop producing today, rivers, creeks and overflow waterways will still remain elevated into the evening hours and possibly through the overnight and into Saturday. STORM RAINFALL POTENTIAL AND DURATION: Light rain showers will produce rainfall rates of 0.1-0.3" in 60 minutes. Moderate to heavy non-thunderstorm rain showers will produce rainfall rates of 0.2-0.6" in 60 minutes. WORST CASE SCENARIO: Training of moderate rain rain showers or a weak to moderate thunderstorm has the potential to produce rainfall amounts of 0.5-1.5" in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 2 Current TO 1159 AM Current TO 1000 AM Jefferson County 2 Current TO 1159 AM Current TO 1000 AM Broomfield County 2 Current TO 1159 AM Current TO 1000 AM Douglas County 2 Current TO 1159 AM Current TO 1000 AM Adams County 2 Current TO 1159 AM Current TO 1000 AM Denver County 2 Current TO 1159 AM Current TO 1000 AM DIA 2 Current TO 1159 AM Current TO 1000 AM Arapahoe County 2 Current TO 1159 AM Current TO 1000 AM the City of Aurora 2 Current TO 1159 AM Current TO 1000 AM Arvada 2 Current TO 1159 AM Current TO 1000 AM Wheat Ridge 2 Current TO 1159 AM Current TO 1000 AM Lakewood 2 Current TO 1159 AM Current TO 1000 AM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Arapahoe Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Boulder Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Broomfield Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Denver Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Douglas Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Jefferson Current TO 1159 AM FRI 0.1" (90%) to 0.3" (45%) to 0.8" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 1159 AM FRI 0.1" (80%) to 0.3" (40%) to 0.8" (10%) ISSUED Douglas Current TO 1159 AM FRI 0.1" (80%) to 0.3" (40%) to 0.8" (10%) ISSUED Jefferson Current TO 1159 AM FRI 0.1" (80%) to 0.3" (40%) to 0.8" (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]