The National Weather Service has issued a tornado watch for the surrounding region, including coastal waters extending out 25 nautical miles south of Martha's Vineyard and Nantucket, and coastal waters from Montauk, N.Y. to Martha's Vineyard extending out to 20 nautical miles south of Block Island. This watch also includes the following includes the following adjacent coastal waters: Vineyard Sound and Nantucket Sound, Boston Harbor, Cape Cod Bay, Buzzards Bay, Rhode Island Sound, Narragansett Bay and Block Island Sound. The watch will remain in effect through 9 p.m.