The cold airmass that is currently over the Eastern U.S. will continue to modify going into Friday and the weekend as the surface high moves offshore and more of a southerly flow commences.
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The anomalous warmth over the Plains will then reach the East Coast on Saturday ahead of the cold front, with highs on the order of 10-20 degrees above normal before reality sets back in for Sunday with colder weather returning.
A sharply colder arctic airmass will sink southward across the northern Rockies, northern Plains, and then the Upper Midwest to close out the work week, with some subzero overnight lows possible across portions of Montana, North Dakota, and northern Minnesota.
Showers and a few thunderstorms are expected to develop starting Friday evening from the Mid-South to the Ohio Valley as moisture is advected north ahead of the approaching front.
This will likely increase in coverage going into Saturday for the Mid-Atlantic and the Northeast U.S., which could end as a brief period of snow across the higher terrain of the interior Northeast states.
Given the progressive nature of the front, rain and snowfall totals will be kept in check with generally light to moderate amounts.
Heavy snow will continue for the Sierra Nevada through Friday morning and then taper off by the afternoon, and then a second round of snow is appearing likely for this region by late Saturday and into Sunday as another storm system approaches California.
Noteworthy snow is also expected across the higher terrain of Utah, Wyoming, and central Colorado as the moisture plume from the Pacific advects farther inland, with up to a foot of accumulation possible.
High winds will also be making weather headlines on Friday across the western High Plains, where high wind warnings are currently in effect from northeast New Mexico to eastern Wyoming.
Winds could gust in excess of 50 mph at times, and there will also be a greater fire weather danger owing to the combination of high winds and low humidity. ■
On 26 January, the Swedish Government decided to extend the previously-adopted entry restrictions requiring all travellers from China to be able to present a negative test result for ongoing COVID-19 infection upon arrival in Sweden, regardless of their vaccination status.