Time: 906 PM Thu May 30, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL MIDNIGHT An upper-level disturbance has moved into northern Colorado this evening creating a line of storms just north of the District. These storms will move SE between 10-15mph with additional storms possible off outflow boundaries into the later evening. Storm motions should help limit point rainfall amounts. However, erratic movement could produce longer lasting localized heavy rainfall. The largest threat of heavy rain will be a quick 0.5” in 10-20 minutes. Storms may also contain large hail up to 1.0” and gusty winds up to 60mph. Currently storms will favor north and northeastern portions of the District, with other storms potentially forming across other portions of the District as the night continues. Storms will start to dissipate by midnight, with the threat for heavy rainfall likely following suit. STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms will produce rainfall of T-0.25” total in 10-30 minutes. Moderate to strong storms have the potential to produce heavy 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 0.50” to 1.00" total in under 30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1159 PM Current TO 1130 PM Jefferson County 1 Current TO 1159 PM Current TO 1130 PM Broomfield County 1 Current TO 1159 PM Current TO 1130 PM Douglas County 1 Current TO 1159 PM Current TO 1130 PM Adams County 1 Current TO 1159 PM Current TO 1130 PM Denver County 1 Current TO 1159 PM Current TO 1130 PM DIA 1 Current TO 1159 PM Current TO 1130 PM Arapahoe County 1 Current TO 1159 PM Current TO 1130 PM the City of Aurora 1 Current TO 1159 PM Current TO 1130 PM Arvada 1 Current TO 1159 PM Current TO 1130 PM Wheat Ridge 1 Current TO 1159 PM Current TO 1130 PM Lakewood 1 Current TO 1159 PM Current TO 1130 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Arapahoe Current TO 1159 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Boulder Current TO 1159 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Broomfield Current TO 1159 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Denver Current TO 1159 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Douglas Current TO 1159 PM THU Trace (60%) to 0.25" (30%) to 0.5" (10%) ISSUED Jefferson Current TO 1159 PM THU Trace (60%) to 0.25" (30%) to 0.5" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 1159 PM THU Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Douglas Current TO 1159 PM THU Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Jefferson Current TO 1159 PM THU Trace (40%) to 0.25" (20%) to 0.5" (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]