Question: Which event caused limited damage in North Carolina and Massachusetts, which was the first hurricane to threaten the East Coast of the United States, since Hurricane Gloria the previous year?

The 1984 Atlantic hurricane season was the busiest since 1971.  It officially began on June 1, 1984, and lasted until November 30, 1984.  These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin.  The 1984 season was an active one in terms of named storms, but most of them were weak and stayed at sea.  Most of the cyclones tracked through the northwest subtropical Atlantic west of the 50th meridian to near the Eastern coast of the United States between mid-August and early October.  The most damaging storm was Hurricane Diana, which caused $65.5 million (1984 dollars) in damage in North Carolina.  Diana was the first hurricane to strike a nuclear power plant without incident; it was also the first major hurricane to strike the U.S. East Coast in nearly 20 years.  Also of note was Hurricane Lili, which lasted well after the official end of the season.  It was downgraded from a named storm on December 24.  Damage overall from the tropical cyclones in 1984 totaled $66.4 million (1984 USD). <SEP>  The third tropical storm and second hurricane of the season, Charley formed as a subtropical low on August 13 along the Florida panhandle.  After moving off the coast of South Carolina, the system transitioned into a tropical cyclone and intensified into a tropical storm on August 15.  Charley later attained hurricane status before moving across eastern North Carolina. Hurricane Charley was the first hurricane to threaten the East Coast of the United States since Hurricane Gloria the previous year.  It gradually weakened over the north Atlantic Ocean before transitioning into an extratropical cyclone on August 20.  Charley's remnants remained identifiable for over a week until after crossing the British Isles and dissipating on August 30. <SEP> Hurricane Gloria was the first significant system to strike the northeastern United States since Hurricane Agnes in 1972 and the first major storm to affect New York and Long Island directly since Hurricane Donna in 1960.  It was also the most intense Category 4 hurricane that did not attain Category 5 status until surpassed by Hurricane Opal in the 1995 Atlantic hurricane season.  It was a powerful Cape Verde-type hurricane that formed during the 1985 Atlantic hurricane season, originating from a tropical wave on September 16 in the eastern Atlantic Ocean.  After remaining a weak tropical cyclone for several days, Gloria intensified into a hurricane on September 22 north of the Lesser Antilles.  During that time, the storm had moved generally westward, although it turned to the northwest due to a weakening of the ridge.  Gloria quickly intensified on September 24, and the next day reached peak winds of 145 mph (230 km/h).  The hurricane weakened before striking the Outer Banks of North Carolina on September 27.  Later that day, Gloria made two subsequent landfalls on Long Island and later western Connecticut, before becoming extratropical on September 28 over New England.  The remnants moved through Atlantic Canada, eventually dissipating on October 2. <SEP> The 1986 Atlantic hurricane season officially began on June 1, 1986, and lasted until November 30, 1986.  Hurricane Charley caused limited damage in North Carolina and Massachusetts, but crossed the Atlantic as an extratropical cyclone and caused considerable damage in the British Isles.  These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin.  During the 1986 season, the first subtropical depression formed in the first week of June, while the last tropical cyclone dissipated at the end of the third week of November.  The 1986 season had lower than average activity because of an ongoing El Niño event, and was the least active season in the North Atlantic since the 1983 Atlantic hurricane season.  This was also the first season since 1972 to have no major hurricanes.  Earl was the strongest hurricane of the season, reaching Category 2 status.  Few storms caused significant damage; Hurricane Bonnie caused heavy rains and flooding across southeast Texas when it made landfall near Sea Rim State Park.