Category

Top Story

Category

It’s the first full week of meteorological winter and winter’s cold is already poised to invade nearly the entire contiguous US.  Although the cold is not expected to test any records, that almost the entire span of the lower 48 will be simultaneously encapsulated by colder than normal temperatures is unusual. In this active weather pattern however, the cold will not necessarily persist. A messy upper-air pattern involving a train of relatively small but potent blips in the jet stream has resulted in Canada’s reservoir of cold spilling southward across the majority of the lower 48. Some of the individual systems that contributed to this pattern were responsible for flooding rains on the West Coast and a rare tornado outbreak in the Midwest. Monday afternoon, the jet stream wrapped uniformly around the southern tier of the US without buckling such that there was very little east/west variance in temperature. The…