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Philadelphia, New York, Boston weather: tornado watch issued

The watch area stretches from Maine to Pennsylvania and is in effect until 8 p.m. A watch means weather conditions are favorable for tornadoes and severe thunderstorms.

Weather Underground/AP
This NOAA satellite image taken Wednesday, June 1, at 10:45 AM EDT shows a broad patch of comma shaped cloud cover over eastern Canada. Showers and thunderstorms develop ahead of this cold front, from parts of Vermont and New York through Pennsylvania and Virginia. Strong daytime heating and increased southwesterly winds ahead of this cold front create favorable conditions for severe weather development during this afternoon.

The National Weather Service has issued a tornado watch for much of the East Coast, including Philadelphia, New York and Boston.

The watch area stretches from Maine to Pennsylvania and is in effect until 8 p.m. A watch means conditions are favorable for tornadoes and severe thunderstorms.

The Weather Service says thunderstorms with 70 mph wind gusts and dangerous lightning are possible. There also could be hail measuring about 2 inches in diameter.

The threat of severe weather comes after a stretch of several days of unseasonable heat. Temperatures have soared into the 90s in spots.

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