Time: 702 PM Thu July 1, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 2'S CONTINUE VALID - All Message 1 LIF's and Message 3's issued earlier have been allowed to expire and the Message 2's (NWS Flash Flood Watch) remain in effect until midnight at this time. Message 2's may be rescinded earlier than midnight as conditions are calming down over the District currently. - Strong thunderstorms with heavy rainfall impacted portions of the District earlier today with scattered light to briefly moderate rain showers currently ongoing over the District. Now that temperatures have cooled into the 60's over the plains and the atmosphere has already been churned the threat for thunderstorms with heavy rainfall is rapidly decreasing as we move forward in time. - Rain showers remain likely through about 9pm then generally dry conditions are expected to develop for the evening and overnight period. A quick 1-2" of rain was observed under the stronger thunderstorms with isolated higher amounts of over 2" in isolated areas. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.1" in 10-30 minutes. Weak thunderstorms will have the potential to produce 0.1-0.4" in 10-30 minutes. WORST CASE SCENARIO: Moderate to strong thunderstorms are able to re-develop with the potential to produce heavy rainfall rates of 0.6-1.8" in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Arapahoe County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM DIA 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Denver County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Adams County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Douglas County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Broomfield County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Jefferson County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Boulder County 2 1100 AM TO 1159 PM 1100 AM TO 900 PM the City of Aurora 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Arvada 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Wheat Ridge 2 1100 AM TO 1159 PM 1100 AM TO 900 PM Lakewood 2 1100 AM TO 1159 PM 1100 AM TO 900 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Arapahoe Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Boulder Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Broomfield Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Denver Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Douglas Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Jefferson Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Douglas Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (10%) ISSUED Jefferson Current TO 1159 PM THU Trace (90%) to 0.2" (40%) to 0.4" (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]