Thunderstorms firing over the northern Plains of the U.S. and into the Canadian Prairies are capable of producing a few tornadoes. Meanwhile, thunderstorms over the southern part of the Atlantic Seaboard can trigger flash flooding and gusty winds.

As a storm system spins over central Canada, a front spiraling outward and extending to the south will be the focusing point for locally damaging thunderstorms Tuesday night over the Dakotas, western Minnesota and as far south as northeastern Nebraska.

Some locations will be hit with straight-line wind gusts, large hail and flash flooding. A handful of the strongest thunderstorms can spin off a tornado. Seek shelter as these storms approach tonight, as they will also generate a great deal of cloud to ground lightning strikes.
The front will push eastward into eastern Minnesota, northwestern Wisconsin and northern Iowa on Wednesday with the same threats.

Accuweather

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Violent thunderstorms pounded Minnesota to western Kansas late on Saturday. Today, more powerful storms will prowl over parts of the Plains as a storm system sweeps past.

After menacing a swath from western Wisconsin to eastern Nebraska this morning, the threat for damaging storms will shift southward and eastward as the day progresses. By tonight, dangerous thunderstorms will roam from eastern Nebraska through Wisconsin into western Tennessee.

During this time, Omaha, Kansas City, St. Louis, Des Moines, Minneapolis and Chicago could be among the cities and towns struck by one of these storms.

AccuWeather

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A dangerous and record-challenging heat wave will continue to affect much of the East this week as high pressure anchored offshore of the Carolinas continues to act as a heat pump.

In some locations this heat wave will rival many that have occurred in the past 20 years with the potential for up to a several-day stretch of temperatures in the upper 90s to low 100s from southern New England to the Carolinas.

Cities from Hartford, New York and Philadelphia to Washington, D.C., Raleigh and Columbia will swelter.

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Less than a week after Hurricane Alex plowed into the northern Mexico coast, it’s looking increasingly likely that the second tropical storm or hurricane of the Atlantic season, Bonnie, will form this week — and potentially track into the southern Gulf of Mexico.

This system raises the concern for renewed flooding in many of the areas that were hit hard by Alex and the prospects that cleanup of the massive BP oil spill in the northern gulf may be interrupted once again.

An area of disturbed weather in the northwestern Caribbean — the area where Alex first developed into a hurricane — became better organized over the weekend. The system is located over warm water, and general atmospheric conditions are favorable for development during the next couple of days.

Experts at the National Hurricane Center are actively monitoring this area of disturbed weather and have given it a 30 percent chance of becoming an organized tropical cyclone (a tropical depression or tropical storm) within the next two days.

tropicalwx.com

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A dangerous and record-challenging heat wave will affect much of the East this week as a once-delightful air mass turns ugly.

In some locations this heat wave will rival many that have occurred in the past 20 years with the potential for up to a several-day stretch of temperatures in the upper 90s to low 100s from southern New England to the Carolinas.

Cities from Hartford, New York and Philadelphia to Washington, D.C., Raleigh and Columbia will swelter.

Temperatures over the Independence Day were just a warm up compared to how nasty the weather will get, especially for those who do not have air conditioning or must do manual labor outdoors.

The highest temperatures will occur Tuesday and Wednesday in northern areas, while southern locations feel the inferno later in the week.

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