surge tide

noun
  1. a powerful and often destructive tide that may occur when an abnormally high tide (e.g. at the autumn equinox) coincides with high wind and low atmospheric pressure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012