Hurricane Karl (1980)

Storm History

Hurricane Karl emerged from a low-pressure area, which was located along a weather front near the southeastern United States. The system approached the Canadian Maritime provinces on the following day and intensified it to an air pressure of less than 1000 millibars (hPa ). On 24 November, this was extended eddy south of Newfoundland. In the early morning of November 25 was formed in the core convection. This evolved into an independent vortex and due to the absence of obstructive wind shear was a small tropical system. The system was declared at 0:00 UTC clock to a sub-tropical storm before it executed a tight loop counterclockwise, and it rotated within the larger cyclone. About 18 hours later, the storm had intensified to the extent and sufficiently developed tropical characteristics to be classified as a hurricane; this was accompanied by the formation of an eye. At this time, the center was located about 1120 km south-southwest of the Azores. Although the formation of a tropical cyclone within an extratropical storm is rare, so it is not an isolated case. An unnamed hurricane of the Atlantic hurricane season 1991 was formed in November 1991, also in this way.