Convective Snowshowers near the CO-NM State Line
February 17, 2008

by John Farley

While driving to New Mexico after the National Storm Chaser Convention, I encountered two bands of rather intense convective snowshowers. These had developed earlier in northern Colorado in association with a short wave in the northerly flow along the Front Range. In fact, it had been snowing at the Raddisson early in the morning on the last day of the Chaser Convention, but accumulations were minor. However, as I discovered driving south, the snowshowers intensified in the high country near Trinidad and in parts of northeastern NM, producing in excess of 3 inches of snow in a few spots in a short time.

After encountering heavy snow with visibility reduced to 1/4 mile or lower just south of Trinidad, I broke out into sunshine around Raton, NM, and stopped at a rest area a little south of there, where I was located in a clear area between two bands of convective snowshowers. The first group of pictures was taken looking southwest, at a band of snowshowers coming off the Sangre de Cristo Mountains and spreading into the Wagon Mound, NM area:

Notice there is a light dusting of snow on the ground here from the passage of this band, but the accumulation was more significant farther south. After I took these pictures, I continued south, encountering moderate to heavy snow with visibilities down to 1/2 mile at the peak intensity a little south of Wagon Mound. This area had at least two inches of snow, most of which had apparently fallen quickly in the past hour or two. A little farther southeast along this same snow band, in Roy, NM, a spotter reported 3 inches of snow.

The next picture was taken looking back north toward the band I had come through around Trinidad. You can't really see much of the cloud tops, but note the snow coming over the top of the mountains and obscuring a part of the mountain range. When I came through this band, I observed a maximum accumulation of around 3 inches, with the road completely snow covered and traffic down to about 35 mph due to the slippery road and poor visibility. I did note one spotter report of 3.5 inches of snow in under 3 hours in this general area - not a great amount, but still tough to drive in when it falls very quickly as it did on this day. Here is the picture looking back north at the Colorado snow band:

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