Pattern supporting flow of polar air shifts to one favoring flow of milder Pacific air.

by: Paul Merzlock, WGN-TV Weather Team

Posted:

Updated:

Temperatures are recovering from the ongoing cold snap

Since Veterans Day, the Great Lakes and Midwest regions have been dominated by air originating over the Arctic. The lowest readings observed this fall came early Sunday morning, when temperatures dropped to about 10 degrees in many suburbs. The 13-degree low at Midway Airport broke that location’s Nov. 20 lowest temperature record in 58 years.

The pattern supporting our more or less continuous flow of polar air has collapsed and is shifting to one that favors a flow of milder Pacific air. Temperatures, which rose above freezing on Sunday afternoon (November 20), will continue to rise, with 50-degree readings expected by mid-week. The approaching air mass is also dry. Generally sunny skies are expected through Wednesday. Low pressure is forecast to develop, bringing the possibility of rain and snow showers and a drop in Thanksgiving night temperatures through Friday. Unlike our last cold-weather fight, this system will be very progressive, leaving territory by Saturday and allowing for a quick return to above-normal temperatures.

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https://wgntv.com/weather/tom-skilling/pattern-supporting-flow-of-polar-air-shifting-to-one-favoring-a-stream-of-mild-pacific-air/ Pattern supporting flow of polar air shifts to one favoring flow of milder Pacific air.

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