National Weather Service Forecast Discussion |
Thornton Weather Forecast Today's Forecast Story |
290 FXUS65 KBOU 250621 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 1121 PM MST Mon Nov 24 2025 .KEY MESSAGES... - Becoming windy later tonight into Tuesday. - Very light snow possible in the mountains tonight and on Wednesday. - First taste of winter weather next weekend, with a chance of snow for the mountains and plains. && .DISCUSSION /Through Monday/... Issued at 244 PM MST Mon Nov 24 2025 Water vapor imagery shows a shortwave trough over Montana headed east-southeastward. This trough will pass well to the north of Colorado late tonight. A cold front associated with the trough will move across the plains early tomorrow morning. This will bring in cooler temperatures tomorrow with highs roughly 5 degrees below normal. This will also bring in gusty winds. The far northeast plains may see gusts up to 45 mph tomorrow afternoon. With such strong winds aloft, the higher mountains will see gusts up to 65 mph tonight and tomorrow morning. In addition, a few light snow showers could occur at high elevations tonight with minimal accumulation. Northwesterly flow aloft will be overhead on Wednesday with subsident flow. Dry conditions are expected with near normal highs. Ridging aloft will move overhead on Thursday and into Friday morning. Mild and dry conditions are expected both days with mostly clear skies. Late Friday through the upcoming weekend will be one to watch for the welcoming of winter to our area. Models disagree greatly on the strength, location, and timing of a longwave trough over Colorado, but they at least all have a longwave trough. Ensemble data shows that highs across the plains have a good chance of staying below freezing with lows in the teens. Ensemble data also shows a moderate snowfall in the mountains is likely with a light snowfall likely across the plains. There could be two waves of precipitation depending on how the shortwave troughs play out within the longwave trough. It`s reasonable to expect that travel will be impacted especially in the mountains this upcoming weekend. Right now the forecast mentions a chance for snow across our entire CWA and there are not many other details to be confident about right now. && .AVIATION /06Z TAFS through 06Z Wednesday/... Issued at 1114 PM MST Mon Nov 24 2025 Will keep the west-southwesterly winds going at DIA until a weak surge of upslope moves across the airport sometime around 12Z-13Z this morning. Models show potential for stronger winds after 15Z so will keep mention of gusts to around 20 knots until around noon. Models also keep the upslope going at the airport all day, but with a more due easterly component this afternoon into early evening. Drainage winds are expected tonight, but are not progged to commence until about 08Z. Cross sections continue to indicate very little low level moisture through the day today even with the upslope flow. There should not be any ceiling issues. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Danielson AVIATION.....66