The "Long Island Express" was first detected over the tropical Atlantic on September 13, although it may have formed a few days earlier. Moving generally west-northwestward, it passed to the north of Puerto Rico on the 18th and 19th, likely as a category 5 hurricane. It turned northward on September 20 and by the morning of the 21st it was 100 to 150 miles east of Cape Hatteras, North Carolina. At that point, the hurricane accelerated to a forward motion of 60 to 70 mph, making landfall over Long Island and Connecticut that afternoon as a Category 3 hurricane. The storm became extratropical after landfall and dissipated over southeastern Canada on September 22.

Blue Hill Observatory, Massachusetts measured sustained winds of 121 mph with gusts to 183 mph (likely influenced by terrain). A U.S. Coast Guard station on Long Island measured a minimum pressure of 27.94 in. Storm surges of 10 to 12 ft inundated portions of the coast from Long Island and Connecticut eastward to southeastern Massachusetts, with the most notable surges in Narragansett Bay and Buzzards Bay. Heavy rains before and during the hurricane produced river flooding, most notably along the Connecticut River.

This hurricane struck with little warning and was responsible for 600 deaths and $308 million in damage in the United States.

Carol formed near the central Bahama Islands on August 25, and moved slowly northward and north-northwestward. By August 30 it was a hurricane about 100-150 miles east of Charleston, South Carolina. It then accelerated north-northeastward, make landfall as a Category 3 hurricane over Long Island, New York and Connecticut on the 31st. The cyclone became extratropical later that day as it crossed the remainder of New England and southeastern Canada.

Sustained winds of 80 to 100 mph were reported over much of eastern Connecticut, all of Rhode Island, and eastern Massachusetts. A peak gust of 130 mph was reported at Block Island, Rhode Island, while gusts of 100 to 125 mph occurred over much of the rest of the affected area. Storm surge flooding occurred along the New England coast from Long Island northward, with water depths of 8 to 10 ft reported in downtown Providence, Rhode Island. Carol was responsible for 60 deaths and $461 million in damage in the United States.

No discussion of Carol is complete without mention of the remarkably similar Hurricane Edna. This storm first formed east of the Windward Islands on September 2. It moved northwestward, and by September 7 it was a hurricane very near where Carol had formed two weeks before. From this point, Edna followed a path just east of Carol's. It accelerated past Cape Hatteras, North Carolina on September 10 and made landfall over Cape Cod as a Category 3 hurricane the next day. Edna moved across Maine into eastern Canada later on the 11th as it became extratropical.

Martha's Vinyard, Massachusetts reported a peak wind gust of 120 mph during Edna, and much of the rest of the affected area had gusts of 80 to 100 mph. The storm was responsible for 20 deaths and $40 million in damage in the United States.