The longest lasting Atlantic hurricane on record

NOAA's re-analysis project has identified a storm called the "San Ciriaco" hurricane of 1899 - named for its impact in Puerto Rico on August 8, 1899 on the name day of Saint Cyriacus on the Catholic calendar - as the longest lasting tropical cyclone on record in the Atlantic basin.

The system formed on August 3 in the tropical North Atlantic, hit the southeastern corner of Puerto Rico with winds estimated to have been 150 mph on the 8th, eventually reached North Carolina as a Category 3 hurricane on the 8/18, transformed into an extratropical storm north of Bermuda on the 21st, redeveloped into a tropical storm on the 8/26, hit the Azores Islands as a Category 1 hurricane on September 3, and finally died as an extratropical storm on September 4.

It was a storm system for 33 days and a tropical storm or hurricane for 28 of those days. This ties the record with Hurricane Ginger of 1971, which also was a tropical cyclone for 28 days.

The world record for a long-lived tropical cyclone is Hurricane/Typhoon John that lasted 31 days in 1994. It started in the eastern Pacific where it was called a hurricane, traversed to the western Pacific where it was called a typhoon, and then curved back to the central Pacific where it was a hurricane again. The storm maintained tropcial characteristics from August 11 until September 10, 1994.