A thunderstorm is a storm with thunder and lightning and typically also heavy rain or hail.
Lightning is the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.
A tornado is a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.
A hurricane is a storm with a violent wind, in particular a tropical cyclone in the Caribbean.
A storm surge is a rising of the sea as a result of atmospheric pressure changes and wind associated with a storm.
Evacuate means to remove many of people (or someone) from a place of danger to a safe place.