An omega block set up over the U.S. in early May, resulting in some noticeable changes, especially in the East.
A southward dip in the jet stream, or upper-level trough, took hold of the Eastern U.S. for the first weekend of May. A slow-moving low-pressure system remained over the Northeast during the weekend and into Monday resulting in a prolonged period of cool, showery weather.
The colder-than-average temperatures allowed some of the precipitation to fall as snow. On Saturday, May 6, snow was reported in the higher elevations of North Carolina and Tennessee.
Sunday into Monday morning this chilly and wet pattern persisted and snow was reported in parts of upstate New York and northwestern Connecticut.
https://weather.com/forecast/regional/news/atmospheric-clog-omega-block-cooler-east-midwest
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