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Storms to Rim Heat From Minneapolis to Detroit, NYC

As a major heat wave blazes much of the central United States through the Labor Day weekend, rounds of storms will rim the heat from the Great Lakes to the Northeast and neighboring Canada.

While most of the storms will not be severe with sporadic rainfall and a mere breeze, a small number of storms can be nasty with damaging wind gusts, hail, frequent lightning strikes and torrential rainfall.

As a result, a few communities can be hit hard by the storms with power outages and flash and urban flooding on more than one occasion. The showers and storms may not be limited to the afternoon and evening hours.

People should be prepared for sporadic travel delays at the airports and on the highways.

Cities that can experience storms on more than one occasion this week include: Green Bay, Wis.; Detroit; London and Toronto, Ont.; Buffalo and Albany, N.Y.; Burlington, Vt.; Portland, Maine; Hartford, Conn.; Pittsburgh, Scranton and Harrisburg, Pa.; and Baltimore, Md.

The heat wave will continue most days over the northern and central Plains to the Ohio Valley with daytime highs well into the 90s. A few spots will even hit 100 degrees.

Over portions of the northern Plains to the Upper Midwest, the intense heat will add to the strength of the storms.

The rounds of storms and a northwesterly flow aloft will keep the heat at bay from the upper and eastern Great Lakes to New England and much of the mid-Atlantic. As a result, persistent hot weather is not likely north and east of the Virginias through this week.

Highs most days from the Upper Peninsula of Michigan to much of New York state, New England, Pennsylvania, Maryland, New Jersey and Delaware are likely to average in the 80s most days. A few locations farther north will peak in the 70s and some locations over Virginia and West Virginia will have some highs near 90.

There is a chance of some of the very hot air riding northeastward next week, but only as long as a current dip in steering-level winds lifts northward. At this time, there are equal chances that cooler air will sag southward next week.

As a result, temperature forecasts for the first full week of September are likely to change.