Multiple videos posted show coastal seabeds drained of their water during Hurricane Irma.
This video, from Key Largo, Florida, shows the drained coast as Hurricane Irma approached Florida Sunday.
The crazy phenomenon is a combination of low tide and offshore winds as the hurricane approaches. Once the hurricane passes, high tide returns.
Tides originate in the oceans and progress toward the coastlines where they appear as the regular rise and fall of the sea surface. When the highest part, or crest of the wave reaches a particular location, high tide occurs; low tide corresponds to the lowest part of the wave, according to NOAA.
Contrary to what some are saying, this is not a tsunami.