Time: 1207 PM Sun May 29, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- MULTIPLE ROUNDS OF SHOWERS AND THUNDERSTORMS FAVORING AREAS NORTH - Upper level disturbance moving overhead today will produce multiple rounds of showers and thunderstorms over the District into the evening. The first round of storms will act to increase surface moisture leading to better chances for brief moderate and heavy rainfall with subsequent rounds of storms later this afternoon and evening. - Moderate to strong thunderstorms will have the potential for brief heavy rainfall. The strongest storms will most likely be hail producers with relatively low freezing levels and storms will be fast moving from SW to NE at 15-25mph helping to reduce point rainfall amounts. - 2-4 rounds of showers and thunderstorms are expected to move through into the evening with prime time for storms from noon today to 2am Monday. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a 0.1-0.3" of rainfall in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.3-0.8" in 10-30 minutes. WORST CASE SCENARIO: Training of thunderstorm cells or a slower moving strong thunderstorm may result in up to 1.5" of rainfall in 45-75 minutes. A LOOK AHEAD: A decrease in overall shower and thunderstorm activity is expected on Monday but there will be a few afternoon and evening showers/thunderstorms with cooler temperatures in the 60's. Thunderstorms Tuesday afternoon and evening will turn into a soaking rainfall overnight with some snow for the Front Range foothills into Wednesday morning. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 200 AM MON 0.1" (100%) to 0.3" (70%) to 0.6" (20%) LOW Arapahoe Current TO 200 AM MON 0.1" (90%) to 0.3" (60%) to 0.6" (20%) LOW Boulder Current TO 200 AM MON 0.1" (100%) to 0.3" (75%) to 0.6" (25%) LOW Broomfield Current TO 200 AM MON 0.1" (95%) to 0.3" (60%) to 0.6" (20%) LOW Denver Current TO 200 AM MON 0.1" (95%) to 0.3" (60%) to 0.6" (20%) LOW Douglas Current TO 200 AM MON 0.1" (85%) to 0.3" (55%) to 0.6" (15%) LOW Jefferson Current TO 200 AM MON 0.1" (95%) to 0.3" (60%) to 0.6" (20%) LOW Foothills above 6500ft       Boulder Current TO 200 AM MON 0.1" (100%) to 0.3" (75%) to 0.6" (25%) LOW Douglas Current TO 200 AM MON 0.1" (95%) to 0.3" (65%) to 0.6" (20%) LOW Jefferson Current TO 200 AM MON 0.1" (100%) to 0.3" (75%) to 0.6" (25%) LOW MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]