Yeah the pattern in general didn't look too great with an east-based -NAO & SCAND, a modest -EPO, and a ridge over the eastern US, but one shortwave slipped underneath the rest is history...
The winter of 1978-79 in general was cold in virtually the entire contiguous US, every climate division was near or below average, with the core of the coldest anomalies centered over the midwest. In fact, 1978-79 is the coldest winter on record in the US. When you're this cold, it doesn't matter as much what the short term synoptic setup looks like, almost anything w/ moisture will drop snow... One of the few times where we had that luxury...
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