Barry should land as a major storm on Saturday. As in the cyclones of the past, the biggest danger may not be the high speed winds, but the water that comes from the ocean.
The increase in water levels, called storm surge, occurs when the winds of a violent storm push water towards the shore.
Storm surges can reach several feet tall, and forecasters have said that Barry could cause up to 4 to 6 feet of storm surge in parts of Louisiana and across the Mississippi border. and Alabama, announced the meteorological service.
But that could change if the storm intensified. Forecasters said that the stronger the storm, the stronger the winds and the stronger the storm.
Once the ocean has crashed on land, it can also exacerbate floods. Rivers and streams that usually flow into the ocean can be clogged further upstream, forcing the water level to rise. This usually leads to more floods in areas soaked by rain.
The rising waters is the deadliest part of a storm
In the approach of a big storm, many people worry about wind and debris. But the water brought by the storm kills most people.
The wind was responsible for only 8% of all deaths.
Dakin Andone, Steve Almasy and Holly Yan of CNN contributed to this report.