Weather patterns follow a 20 year period of bad hurricane seasons and then mild hurricane seasons. It's caused by the speed of water in the Atlantic ocean when it follows the stream up and around Greenland ... the faster it goes, the warmer the water becomes (because it doesn't retain the cold water as well) when it's back south west of Africa... the latest trend began in 1994, so we still have another decade of particularly nasty hurricanes.
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