Time: 737 PM Mon May 20, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 9:00 PM Explosive storm development has persisted for areas east of I-25 and will continue over the next hour or so. These rapidly developing storms have contained lots of hail, heavy rain, and frequent cloud-to-ground lightning. Storm movement has been relatively fast, between 20-30mph, however a few storms have stalled out east and could continue to slow as they move out of the District. Storms should weaken as the sun sets as they continue to move eastward. The threat of heavy rainfall will likely diminish after 9pm with skies gradually clearing overnight. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce rainfall of a T-0.25” total in 10-30 minutes. Moderate to strong showers have the potential to produce rainfall of 0.25” to 0.50” total in 10-30 minutes. WORST CASE SCENARIO: Strong stationary, or training of thunderstorms has the potential to produce 1.00” in under 60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Adams 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 County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 900 PM MON 0.25" (60%) to 0.5" (30%) to 1" (10%) ISSUED Arapahoe Current TO 900 PM MON 0.25" (60%) to 0.5" (30%) to 1" (10%) ISSUED Denver Current TO 900 PM MON 0.25" (60%) 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]