heart attack snow
n.— «With temperatures within striking distance of freezing during much of this precipitation event, the snow which falls is to be heavy and fairly wet—what’s often referred to as “good packing” or “heart attack” snow. The weight of such snow means it must be shoveled with extreme care to avoid a heart attack.» —“Major winter storm on the way” by Tom Skilling WGN Weather Center Blog Feb. 5, 2008. (source: Double-Tongued Dictionary)
Further reading
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Storms like this I have also heard called, in New England, “Widowmakers”