Rounds of thunderstorms, including severe weather, will affect the Midwest this weekend into Monday, ahead of a push of unseasonably cool air.
While the effect of the July sun and warm landscape will cancel some of the cool air, it will become surprisingly cool during what is typically the hottest time of the year.
According to AccuWeather Meteorologist Carl Erickson, "The pattern is reminiscent of a major polar plunge that occurred this past winter, which was referred to as the Polar Vortex."
A piece of the Polar Vortex, and a summertime version at that will break off from the Arctic and drop southward this coming week.
The pattern will not bring snow or sub-zero cold but it will bring angry clouds, cool air and the risk of waterspouts over the warmer portions of Great Lakes.
The pattern will deliver multiple days with high temperatures in the lower 70s in Chicago and Detroit and even a day or two with highs in the 60s in Minneapolis and other parts of the Upper Midwest.
For fans heading to the All-Star Game at Minneapolis, the it may seem more like football weather. Jackets and long sleeves may be needed by many fans to stay comfortable.
At night, temperatures could challenge record lows from the Midwest. Temperatures will drop into the 50s at night in many cities and will dip into the 40s in some of the suburbs and rural areas.
The cooler air will move in aloft before reaching ground level. As this happens, an unstable atmosphere will trigger episodes of thunderstorms, some of which will be severe in parts of the region.
Sunday and Monday, the threat of severe weather will shift to the Northeast and southward through the Ohio and Tennessee valleys.
The greatest threats these days will be damaging wind gusts, flash flooding and frequent lightning strikes.
Cities in the threat zone on Sunday include Erie and Pittsburgh, Pennsylvania; Cleveland, Columbus and Cincinnati, Ohio; Indianapolis and St. Louis. The danger will shift to Charleston, West Virginia, Lexington, Kentucky, and Nashville, Tennessee on Monday.
Also on Monday, thunderstorms with small hail will erupt in the vicinity of Kansas City, Missouri.
After the cool air takes root in the Midwest through midweek, waterspouts will be a threat to boaters, fishing and beach interests over the southern portion of the Great Lakes.
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Heavy rain will soak the Gulf Coast and expand into the Southeast early this week, perhaps bringing isolated flooding but also helping to battle the drought.
A change in the weather pattern will turn off arctic air invasions and allow the March sun to go to work over much of the central and northeastern United States next week.
Interstate 64 was closed between Reidland and Cadiz, Kentucky, due to heavy snowfall. Kentucky Gov. Steve Beshear activated the Kentucky National Guard to assist stranded motorists.
The explosion was one of five such incidents in the borough late Wednesday into Thursday according to the New York City Fire Department.
This week, rounds of snow, rain and ice pummeled areas from Oklahoma City to Boston, creating treacherous travel conditions and causing widespread power outages in the tens of thousands across the country.
East Coast (1962)
Great Atlantic Coast Storm caused over $200 million damage from New England to Florida. Major shoreline erosion from Long Island to North Carolina from 40 foot waves, 70 mph winds. Deep snow piled up in Virginia Mountains. Big Meadows/Blue Ridge Mts. (6th-7th) had 42.0" of snow, greatest 24 hour snowfall.
Winnipeg, Manitoba (1983)
Severe ice storm in the city and over southern Manitoba. Winnipeg International Airport closed until the 8th and several TV towers collapsed.
Heat Wave Location New Record Old Record Corpus, Christi 99 91/1930 (warmest ever for so early in the season) San Antonio 100 91/1916 (warmest ever for so early in the season and also a March record)