Definition: Storm surge is the abnormal rise in seawater level during a storm, measured as the height of the water above the normal predicted astronomical tide.
(Mostly caused by storm winds pushing water onshore)
Past:
Bhola Cyclone - Deadliest storm surge on record. 500,000~ dead. Struck East Pakistan and India’s West Bengal on November 11, 1990. Storm surge: 20 ft (or 6 m)
Hurricane Katrina- 2000~ dead. Hit the gulf coast and New Orleans on August 23, 2005. Storm surge: 30 ft (or 9.1 m)