Southwest flow is a great weather feature! It brings in the warmer/milder temperatures ahead of any approaching system AND in the instance of Tuesday afternoon… it helped scour out the cloud coverage a bit. “Mares Tails” were still visible in the upper levels and that is a good indication of strong winds aloft/indication of incoming unsettled weather.
The southwest flow will induce added cloud coverage Tuesday night and out low temperatures across the board will be warmer than the average. GJ/MT typically strikes a low near 20°. Low temps Wednesday morning should exceed that norm by 5-15 degrees. Dry conditions remain until the early morning hours when the first opportunity of rain can sweep through. Though, these rain, rain/snow and snow showers are relegated to the high country until the late afternoon hours for many valley locations. Snow should start to accumulate after 2 am for the high country and that also includes the ranch country on the Uncompahgre. Collbran/Mesa should see snow flakes to start the day. If your travelling eastbound I-70 expect late day delays/traffic issues. A Winter Weather Advisory is in place from Wednesday morning until Thursday morning. 6-12 inches of snow and blowing snow will be the criteria met for this period. Bands of snow squalls are also possible during Wednesday afternoon. Travel cautiously and check with C-DOT for the latest conditions. Thursday will be colder and unsettled as the front passes through the region and engages the northwest flow machine. Mountains should continue to receive snow through Saturday, but under this NW flow- the Grand Valley and the Uncompahgre Valley (Montrose) can still see snow falling. Temperatures will remain cold/normal and the conditions look to dry into this weekend.