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Storm Surge

Storm surge

A storm surge is a rise in water level caused by a combination of wind and low atmospheric pressure. It is the most destructive force of a hurricane (an intense cyclone that forms over warm tropical oceans; called a typhoon when it occurs in the western Pacific Ocean and adjacent seas)

Formation of a storm surge

When a hurricane is forming over open, warm ocean waters, the wind pushing the water and the low atmospheric pressure in the eye of the hurricane cause the level of the sea to rise, whipping the water into gigantic waves. Because this is happening away from land, the water can escape and move freely away from the building storm. But as the hurricane moves towards land and the depth of the water becomes more shallow, the ever-increasing wall of water does not have a chance to flow away. Instead it is built up around the eye of the hurricane and forms huge waves. These mountainous waves pound against the land and anything in its pathbuildings, homes, piers, and people. Storm surges can be more devastating depending upon the strength of the hurricane's winds and the shallowness of the off-shore waters.

Storm tide

A storm surge can also become much more destructive if it occurs during high tide (an increase in water level due to the Moon's gravitational pull on Earth). This is called a storm tide. For example, if a normal high tide for a particular area is three feet and a storm surge occurs at the same time with fifteen-foot waves, a storm tide with eighteen-foot waves is formed. This occurrence makes the storm surge even more devastating.

Words to Know

Atmospheric pressure: The pressure exerted by the atmosphere at Earth's surface due to the weight of the air.

Hurricane: A severe swirling tropical storm with heavy rains and winds exceeding 74 miles (119 kilometers) per hour.

Tide: The periodic variation in the surface level of the oceans, seas, and bays caused by the gravitation attraction of the Moon (and to a lesser extent the Sun).

Storm surge destruction

Storm surges have long been recognized as the most destructive part of a hurricane. Causing drownings and property destruction, this incredible wall of water stops for nothing in its path. As it moves across the land, it picks up and carries with it debris that it finds along the way, such as cars, utility poles, and boats. A hurricane hit Galveston, Texas, in 1900 and killed 6,000. The storm surge from the "Great Galveston Hurricane" formed waves that were twenty-five feet high. In 1970, the Bay of Bengal in Bangladesh suffered through a hurricane that produced a storm surge with thirty-foot-high waves that killed approximately 200,000 people.

Prevention of damage

After suffering through such incredible devastation, the city of Galveston completed the building of a seawall four years later. A little over three miles long and seventeen feet above average low tide mark, the Galveston seawall would act as a line of defense by interfering in the progress of the storm surge's attack on the land and by catching some of the destructive debris that it carries along its way. The city of Galveston

also actually raised the level of the city after devoting ten years to the project. The entire cityevery church, home, and businesshad 14 million cubic yards (10.7 million cubic meters) of sand poured in underneath it. The combination of building a seawall and raising the level of the city helped increase the odds of Galveston successfully surviving a storm surge. The investment in prevention paid off: On August 16, 1915, a hurricane of almost the same force as the 1900 storm hit the city. While the 1915 hurricane was still tragicabout a dozen people lost their livesthe number of deaths was far below the 6,000 in 1900.

[See also Cyclone and anticyclone ]

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storm surge

storm surge A rise or piling-up of water during a storm, as a result of wind stresses acting on the surface of the sea and of atmospheric-pressure differences. If a storm surge occurs at the time of highest spring tides, flooding of coastal areas may result, as happened in the Netherlands and East Anglia, England, in 1953.

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storm surge

storm surge Rise or piling-up of water during a storm, as a result of wind stresses acting on the surface of the sea and of atmospheric-pressure differences. If a storm surge occurs at the time of highest spring tides, flooding of coastal areas may result, as happened in Holland and East Anglia, England, in 1953.

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storm surge

storm surge: see under storm.

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