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      25 / 20

      One of the Great Late-March Storms: March 25, 1975

      The storm moved slowly eastward into the Great Lakes south of Upper Michigan. This is a perfect track for heavy snow.

      March 24-25, 1975 brought one of the great late-March snowstorms to the Upper Peninsula. The storm developed in a familiar spot--the central Plains of Colorado and Wyoming on March 23. It then wound up and headed slowly northeastward. Its path took it just to the south of the U.P.--the perfect track for heavy snow Images 1 and 2 above).

      The National Weather Service (NWS) near Negaunee collected 19.8 inches on the 24th, with a water-equivalent of 1.98 inches. So it was a heavy, wet snow. The city of Marquette recorded 17.6 inches for the two-day event. And Alger County's Chatham wound up with a whopping 32 inches of new snow.

      Behind the system, cold weather set in. Temperatures stayed below average through the middle of April before the first signs of spring warmth showed up. The last of the winter snow finally disappeared in the City of Marquette on April 17.

      We are still locked in a mid-winter pattern this March. The bitter cold of today will likely be the last really cold blast because we are about to transition into a spring pattern. By this, I donâ??t necessarily mean a warm spring pattern. It is just that the march of the seasons is bringing us to a point where the pattern of winter that featured huge, full-latitude troughs and ridges is breaking down. That means we will not be seeing Siberian air cross the North Pole into Canada and plunge into the Great Lakes. It will be more of a garden-variety, spring-time cold. A westerly flow aloft will develop starting Wednesday. This will lead to a moderation in temperature and a good chance of some snow. However, unlike the 1975 storm, this event for Thursday into Thursday night does not look like a major one.