Tropical storm Isaias, still packing 70 mph winds after making landfall on the North Carolina coast late Monday night, remains on course to pummel the Berkshires with gusts close to 50 mph and heavy rain.

But a slight westward shift in the storm's track means somewhat less rain for Berkshire County — an inch or two — than originally predicted, but more impact from high winds, according to the National Hurricane Center.

At 11 a.m., the storm was picking up speed over eastern Maryland, heading for New Jersey and the New York metro area, the hurricane center reported.

A tropical storm warning remains in effect for Western Massachusetts until 4 a.m. Wednesday, and a flash flood watch continues until 8 a.m. Wednesday, the National Weather Service in Albany, N.Y., said.

"The main impacts from the storm will be scattered flash flooding and isolated, probably minor wind damage late this afternoon into Wednesday morning, as well as an isolated tornado threat in western New England and eastern New York state," the government forecasters said on Tuesday.

A mid-morning tornado warning issued for adjacent, northwestern Franklin County was canceled after a dangerous storm passed with no funnel clouds sighted. Communities briefly warned included Cummington, Plainfield, Charlemont, Hawley, Monroe and Rowe.

Numerous tornadoes were reported over portions of the mid-Atlantic coast Tuesday morning. The threat of tornadoes will continue along the mid-Atlantic coast, spreading into New England later in the day, the hurricane center warned in its late-morning update.

Isaias will remain inland over eastern Pennsylvania and western New Jersey, speeding up and passing about 50 miles west of New York City and near Dutchess County, N.Y., before sunset, Tuesday the forecasters predicted. Then, heading north-by-northeast, it will pass just west of Albany, slicing into northwestern Vermont and ending up near Quebec City before dissipating.

The heaviest rain over Berkshire County is expected during the late afternoon Tuesday until close to midnight, but the most torrential downpours are likely just west of the Hudson Valley.

The flood threat has decreased for western New England, but the possibility of flash flooding can't be ruled out, forecasters stated, because of the saturated tropical air mass overhead.

The strongest southeasterly winds, gusting up to 50 mph, are likely over the Berkshires during Tuesday afternoon and early evening, possibly downing some branches and trees. There's a slight risk of severe thunderstorms and a tornado.

As the storm pushes into Canada, clouds should break on Wednesday and a five-day stretch of pleasant summer weather is expected through Sunday, with clear skies, daytime highs near 80, and refreshing overnight lows in the 50s.

Clarence Fanto can be reached at, on Twitter @BE_cfanto or at 413-637-2551.