National Weather Service Forecast Discussion |
Thornton Weather Forecast Today's Forecast Story |
985 FXUS65 KBOU 090000 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 500 PM MST Thu Jan 8 2026 .KEY MESSAGES... - Scattered snow showers will continue this afternoon before snow increases in coverage later tonight. Heaviest snowfall is still expected to fall across the southern foothills and Palmer Divide tonight. - A Winter Weather Advisory was issued for southern Lincoln and Elbert Counties tonight into tomorrow for snow and gusty winds. - The coldest temperatures will occur Friday night with lows in the low teens across the plains and urban corridor. - Moderating temperatures this weekend, with dry weather prevailing through early next week. - The next chance for precipitation will come Wednesday into Thursday. && .DISCUSSION /Through Thursday/... Issued at 248 PM MST Thu Jan 8 2026 Water vapor imagery shows a departing shortwave trough currently over southern Iowa with the deformation zone on the west side of the trough departing eastern Colorado. The QG ascent that was over our forecast area has shifted to neutral stability this afternoon resulting in limited coverage of snow showers. However, the steep lapse rates in the mountains have lead to a few scattered snow showers developing over the higher terrain. Some of these may drift over the western I-25 corridor before dissipating with minimal snow. Without QG forcing aloft, these scattered weak snow showers will be the only precipitation that occurs through the evening hours. Water vapor imagery also shows a shortwave trough that is becoming stronger over Arizona. This trough will head eastward tonight and will end up over the Oklahoma panhandle Friday evening. This trough will bring weak QG ascent to our forecast area especially the southern half of our forecast area later tonight. Around midnight to 3AM tonight, models have been consistent in showing a cold front with moderate northerly winds moving through the I-25 corridor. Given the moisture currently in place, this front will help to develop snow showers over the I-25 corridor and southern foothills tonight. While high resolution models are all over the place regarding snow in the Denver metro tonight, the thinking is that 0.5-2" of additional accumulation is still likely to fall with the higher amounts on the south side of the metro. Over the Palmer Divide and eastward into Lincoln County, the upslope flow behind the front along with the QG ascent from the passing trough will combine to create more widespread snow. For southern Elbert and Lincoln Counties, the snowfall forecast was uncertain but 2-6" is the best estimate. If that were to occur, the strong winds up to 45 mph that are expected to form later tomorrow morning, will blow the snow around and could create low visibility and hazardous travel conditions. Therefore, a Winter Weather Advisory was issued for that area from midnight to 11 AM. The mountains will continue to see light snowfall throughout the night. Given the precipitation currently occurring on the Grand Junction radar, generally 2-4" of additional snow accumulation will fall by midday tomorrow. Subsident flow will quickly move over our forecast area by midday Friday which will put an end to the snow. It will be a chilly and breezy day compared to what we have gotten used to in Denver this winter. Wind chills will be in the low 20s throughout the daylight hours and will fall to the single digits Friday night. Air temperatures will fall to the teens across the plains and to the single digits in the foothills and mountain valleys Friday night. Saturday through Tuesday will have dry weather with warming temperatures. Highs across the plains will reach the 50s on Sunday and some 60s are possible on Monday and Tuesday. The next chance for precipitation will come Wednesday into Thursday. A couple of shortwave troughs within the northwesterly flow aloft could bring snow to the mountains and a mix of snow and rain to the plains. && .AVIATION /00Z TAFS through 00Z Saturday/... Issued at 500 PM MST Thu Jan 8 2026 Low clouds with ceilings of 1000-2000 feet will persist through the night (12Z Friday). The lull/break in snow is expected to continue this evening with an increase in snow showers 04-06Z. APA and BJC will see the best chance for snowfall with fewer snow showers expected for DEN. Winds will be light and variable much of the night. A stronger northerly surge is then expected 10-12Z. Drier air will move in behind this northerly surge with the threat for snow ending 11-13Z. Ceilings slowly improve with visual landing conditions expected 18-21Z. && .BOU WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until 11 AM MST Friday for COZ031-033- 034-036-041. Winter Weather Advisory from midnight tonight to 11 AM MST Friday for COZ047. && $$ DISCUSSION...Danielson AVIATION...12