Chunks of polar vortex to arrive finally next week in the East

Chunks of polar vortex to arrive finally next week in the East

(Photo by Angela WEISS / AFP)

(NEXSTAR/WOWK) — An Arctic blast is beginning to make its way south and east through the U.S., bringing the coldest air of the season to most of the country, and the cold air might stick around for most of February.

The freezing air is due to chunks of the polar vortex weakening and allowing much colder air to head southward into the United States.

The polar vortex is usually contained over the Arctic and North Pole by the prevailing jet stream winds. A “sudden stratospheric warming event,” which happens about six times a decade, according to NOAA, destabilized the polar vortex. During these events the winds that normally flow from west to east around the pole weaken dramatically and can even reverse direction. This allows large chunks of Arctic air to seep south instead of being “fenced in” around the Arctic.

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The coldest air of the winter is forecasted to break off from the vortex and trek southward across much of the United States, reaching the WOWK viewing area by next weekend. While models are simply projections, a scan of possible low temperatures by next weekend in the WOWK area shows incredible cold rolling in.

GFS Model output for lows Sunday FEBRARY 14 (not this coming Sunday Feb 7)

The big chill has meteorologists buzzing about the cold as far south as Texas next week, according to KXAN.

Parts of Michigan are already facing storms and will see their first sub-zero temperatures in nearly two years – since the last polar vortex visited that area.

Wind chills in parts of North Dakota have a chance of reaching minus 50 degrees Friday night, with wind chills in parts of South Dakota not much better at minus 20 to minus 30.

The National Weather Service in Chicago has warned of dangerous wind chills in that area as well, and CNN reports that all 50 states may hit below-freezing temperatures by Monday.

The worst of the cold will shift east with time, and may move to the Mid-Atlantic and Northeast by the second half of next week, according to The Capital Weather Gang.

The one warm spot in the forecast? Tampa on Super Bowl Sunday will see highs in the low 70s and there is a 50% chance of rain in the morning and early afternoon.

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