On the 23rd and 24th July 1939 an eruption of Kick 'em Jenny broke the sea surface,
sending a cloud of steam and debris 275 m (902 ft) into the air and generating a series of tsunamis
around two metres high when they reached the coastlines of northern Grenada

Source: https://goo.gl/enQ7yY

On the 12th April 2011 there were Numerous reports of flooded houses, landslides, road blockages, sunken boats and destroyed houses. In Gouyave, one house was destroyed by the violent river, which overflowed its bank. Road access from Waltham St. Mark to Victoria was blocked. Also, the Balthazar bridge was also flooded. In Clozier, St. John, access to Gouyave was cut off due to a land slide. 11 boats sunk in Victoria, St. Mark. Five major landslips in Gouyave, with about three houses lost along the river and other properties flooded. However, there were no reports of loss of lives.

In Grenada Hurricane Emily blasted out windows and flooded two main hospitals and tore roofs from homes damaged by the previous year (2004) storms. Hurricane Emily hit Grenada with winds of 90 m.p.h.
The storm grew to a dangerous Category 3 as it cleared the Windward islands, unleashing heavy surf, gusty winds and torrential rains on islands hundreds of kilometers away.