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Is summer weather over for midwestern, northeastern US? ‘More coolness to come’

By Alex Sosnowski, AccuWeather senior meteorologist

More coolness to come

Cool air will linger into the third week of August across much of the Northeast and Midwest due to a weather pattern that will stay put.

“Into the third week in August, a jet stream pattern will set up that resembles the Greek letter omega across the northern U.S. and southern Canada,” according to AccuWeather Lead Long-Range Meteorologist Paul Pastelok.

Pattern NC, NE into Aug 15

The jet stream is a high-speed river of air located at the level in the atmosphere where jets cruise.

The omega block creates somewhat of an atmospheric traffic jam. More cool air will jam into the Northeast. Waves of warm and cool air will flow over the North Central states. The most persistent warmth is likely over the northern High Plains.

“Essentially, this omega block will keep big heat locked up in the Southwest for much of the third week of August,” Pastelok said.