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Unusual Mid-July Cool Down Could Set Record Lows

July 14, 2014

UPDATED By WeatherBug Sr. Meteorologists, John Bateman and James West

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An unusually strong dip in the jet stream is ushering unseasonably cool and dry air into the Upper Midwest. This wave of cool air will spread into the rest of the Midwest, Great Lakes and Northeast over the next several days.

The burst of cool is due to a noteworthy and unseasonable dip in the Jet Stream. This dip is is allowing the jet to "grab" some of that chilly air bottled up in northern Canada and shuttle it down into the Lower 48.

How cool are we talking? Some locations in the Northern Plains, Midwest, and eventually the East Coast could be as much as 20 or more degrees cooler than average for this time of year. Morning temperatures could even threaten record-low temperatures across the Upper Midwest Tuesday.

It appears the Nation`s Heartland will be the focus of the most dramatic cool-down. Lows in International Falls, Minn., could drop to the middle 40s Tuesday morning, with Minneapolis, Milwaukee, and Chicago cooling to the low-to-mid 50s. Along the Canada/U.S. border, high temperatures remained in the 50s Monday afternoon. By Tuesday afternoon, high temperatures will likely stay in the 60s across the Northern Plains and western Great Lakes.

By Wednesday morning, as the cool pool funnels eastward, lows in the 50s will spread to St. Louis, Cincinnati, Detroit and Pittsburgh. Highs may only hit the lower 70s in these locations by Wednesday afternoon. East Coast cities will likely feel its moderated effects Wednesday and Thursday afternoon, as highs run 8-12 degrees below normal.

As usual for mid-summer, this break from the heat will not last long as temperatures rebound across the U.S. heading into next weekend.

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