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    Colder Pattern for Great Basin/Colorado Snowstorm

    12/04/2012, 11:37:24 PM

    All the rainstorms hitting the West Coast in the last week have flooded much of the interior West with much warmer-than-normal air. Temperatures have been running 10 to more than 15 degrees above normal over the last six days, but the weather pattern will be changing by the end of the week and weekend ushering in a colder air mass.

    The due west flow aloft right now turns northwest with time and a series of disturbances helps to start carving out a broad trough over the Great Basin. The last of these disturbances will be the strongest this weekend. The models have been different on the details the last few days. While there still are some differences, the models are closer together on the overall pattern while the last disturbance is likely to produce snow showers, first over the Wasatch Range then maybe in some of the Utah Valleys, it’s the change to colder temperatures and some wind that most people will notice.

    Here is a chart of what the last six days have brought in temperature departures, what is normal and what I am expecting high temperatures to be this weekend.

    So this weekend temperatures are actually going to be below normal over a large area.

    The place to be for important snow out of this is probably farther east. The mountains and Front Range of Colorado may be looking at a substantial snowstorm, especially Saturday night and Sunday. This easily could bring a foot or more to the mountains and even significant accumulations of 4 to 8 inches on the Front Range. This is an early projection and there is a way accumulations could be higher in spots. Colorado ski country sure has not seen much snow of late, and if this storm pans out, there are going to be a lot of happy people.

    The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com

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    Western US weather expert