Time: 846 AM Thu September 8, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- RECORD BREAKING HEAT ONCE AGAIN TODAY BUT BIG CHANGES ARE ON THE WAY - One more day of record breaking heat ahead of a cold front that will move through later this evening and overnight. Highs this afternoon will reach the mid 90's to around 100 degrees over the plains. Normal high for Denver today is 83 degrees, record high for Denver today is 94 degrees. The record high should easily be broken by early afternoon. There will continue to be haze/smoke from wildfires over the Pacific NW reducing visibilities and making for colorful sunsets. - Generally dry conditions are expected through the day but there may be a few isolated rain showers and possibly a high-based weak thunderstorm ahead of the front late this afternoon and evening. Better chances for rain showers will be behind the frontal passage overnight into daybreak on Friday but any moisture expected to be minimal. - Winds will be increasing overnight, becoming breezy at times from the N at 10-20mph, gusting to 25-30mph or more briefly. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and high-based weak thunderstorms will produce rainfall amounts of a trace to 0.2" in 10-30 minutes. WORST CASE SCENARIO: A moderate to strong thunderstorm is able to develop this evening with the potential to produce rainfall rates of 0.2-0.5" in 10-30 minutes. A LOOK AHEAD: Official high temperatures for Friday will likely be reached just after midnight tonight as readings through the day will generally be in the 60's to around 70 over the plains with 50's in the Front Range foothills. There will be better chances for afternoon showers and thunderstorms Friday afternoon with scattered rain showers expected to fill in during the evening and continue overnight into early Saturday morning. Friday evening to Saturday morning will be the best chances for wetting rain. Heavy rainfall is not expected as the cooler temperatures will likely favor stratiform rain showers versus convective thunderstorms. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Arapahoe 500 PM TO 800 AM FRI Trace (60%) to 0.1" (40%) to 0.2" (20%) NONE Denver 500 PM TO 800 AM FRI Trace (60%) to 0.1" (40%) to 0.2" (20%) NONE Douglas 500 PM TO 800 AM FRI Trace (60%) to 0.1" (40%) to 0.2" (20%) NONE Adams 400 PM TO 800 AM FRI Trace (60%) to 0.1" (40%) to 0.2" (20%) NONE Broomfield 400 PM TO 800 AM FRI Trace (60%) to 0.1" (40%) to 0.2" (20%) NONE Jefferson 400 PM TO 800 AM FRI Trace (75%) to 0.1" (50%) to 0.2" (20%) NONE Boulder 300 PM TO 800 AM FRI Trace (75%) to 0.1" (50%) to 0.2" (20%) NONE Foothills above 6500ft       Boulder 200 PM TO 800 AM FRI Trace (85%) to 0.1" (60%) to 0.2" (25%) NONE Douglas 200 PM TO 800 AM FRI Trace (85%) to 0.1" (60%) to 0.2" (25%) NONE Jefferson 200 PM TO 800 AM FRI Trace (85%) to 0.1" (60%) to 0.2" (25%) NONE MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]