Karl is a small storm. Probably one of the smallest tropical cyclones on record besides Marco (2008) and Tracy (1974). Karl is so small that it could easily fit inside of Ike or Katrina's eye.

It is over some of the warmest waters in the Atlantic Basin. That is fuel for hurricanes.

Its small size and warm water would allow it to rapidly intensify into a hurricane, probably into a major hurricane. I would not be surprised if Karl goes under explosive development like Humberto did in 2007.
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