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      April 22: Hang on! Spring is Coming.

      A trough over central North America will be responsible for another snowstorm for parts of Upper Michigan.

      Another heavy snow event is on the way for folks in the western U.P. that got blasted last week. A strong disturbance will induce low-pressure development along a stalled front running from the central U.P. southward. Heavy snow has developed out to our southwest from eastern Nebraska, eastern South Dakota into west-central Minnesota. The precipitation will expand northeastward tonight into the western U.P. Farther east the low will move through central Upper Michigan. Enough warm air has wrapped in ahead of the low so that mostly rain is expected over the central U.P. and only rain in the east. Up to a foot of wet, heavy snow is likely, especially over higher elevations from Ironwood northeast to the Copper Country later tonight into tomorrow morning.

      If you are winter weary, hang on; a bout of spring weather is on the way. All medium range computer forecast models are advertising a major pattern change. The deep, cold trough that has been a constant over central North America over the last month-plus is forecast to retrograde or â??back upâ?? into western North America (Images 2 and 3 above). That means a mild western flow will initially develop late this week for a significant warm up. As time wears on, upper-air ridging may encompass the Great Lakes region. That could mean some genuinely warm weather as we close out April.