I thought that the tidal surge you get from large tropical storms are caused by high but very localised pressure difference and wind speed pushing, acting on, the water that was already there, I don't think that any additional water has been pulled in from anywhere.

Seen and experienced the effects of two hurricanes close up while at sea on an RN ship acting as "Hurricane Guard Ship" out in the West Indies. This Hurricane season seems to be a very active one with fierce Hurricanes sweeping in one after another which makes relief and emergency work extremely difficult.