We went through exactly this three weeks of snowy hell in the winter of 1970-1980. The jet stream changed course and plunged down into the Midwest. The Polar Express brought down lots of supercooled air from the pole that collided with warm, moisture laden air from the south combined with winds blowing from SSW. We endured snow storm after storm for three weeks straight. The snows came so frequently the plows couldn't handle it. We ran out of places to put it. Daytime air temperatures were -25 degrees F every day for 21 days; nighttime temperatures were -40 degrees F.
I'm a survivor.