Puricare Industrial Enterprises: STORM SURGE - Storm surge is the rise in seawater level caused solely by a storm. Storm tide is the total observed seawater level during a storm, which is the combination of storm surge and normal high tide. Storm surge is the abnormal rise in seawater level during a storm, measured as the height of the water above the normal predicted astronomical tide. The surge is caused primarily by a storm’s winds pushing water onshore. The amplitude of the storm surge at any given location depends on the orientation of the coast line with the storm track; the intensity, size, and speed of the storm; and the local bathymetry. Storm tide is the total observed seawater level during a storm, resulting from the combination of storm surge and the astronomical tide. Astronomical tides are caused by the gravitational pull of the sun and the moon and have their greatest effects on seawater level during new and full moons—when the sun, the moon, and the Earth are in alignment. As a result, the highest storm tides are often observed during storms that coincide with a new or full moon. Powerful winds aren’t the only deadly force during a hurricane. The greatest threat to life actually comes from the water – in the form of storm surge. Storm surge combined with waves can cause extensive damage. It can severely erode beaches and coastal highways. The pounding waves can take out boats and buildings.

Thursday, November 26, 2020

STORM SURGE - Storm surge is the rise in seawater level caused solely by a storm. Storm tide is the total observed seawater level during a storm, which is the combination of storm surge and normal high tide. Storm surge is the abnormal rise in seawater level during a storm, measured as the height of the water above the normal predicted astronomical tide. The surge is caused primarily by a storm’s winds pushing water onshore. The amplitude of the storm surge at any given location depends on the orientation of the coast line with the storm track; the intensity, size, and speed of the storm; and the local bathymetry. Storm tide is the total observed seawater level during a storm, resulting from the combination of storm surge and the astronomical tide. Astronomical tides are caused by the gravitational pull of the sun and the moon and have their greatest effects on seawater level during new and full moons—when the sun, the moon, and the Earth are in alignment. As a result, the highest storm tides are often observed during storms that coincide with a new or full moon. Powerful winds aren’t the only deadly force during a hurricane. The greatest threat to life actually comes from the water – in the form of storm surge. Storm surge combined with waves can cause extensive damage. It can severely erode beaches and coastal highways. The pounding waves can take out boats and buildings.

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This example illustrates water level differences for storm surge,
storm tide, and a normal (predicted) high tide as compared to sea level.
Storm surge is the rise in seawater level caused solely by a storm.
Storm tide is the total observed seawater level during a storm,
which is the combination of storm surge and normal high tide

Storm Surge

What is storm surge?

Storm surge is the rise in seawater level caused solely by a storm.

The Ocean Today

Storm surge is the abnormal rise in seawater level during a storm, measured as the height of the water above the normal predicted astronomical tide.

The surge is caused primarily by a storm’s winds pushing water onshore.

The amplitude of the storm surge at any given location depends on the orientation of the coast line with the storm track; the intensity, size, and speed of the storm; and the local bathymetry.

Storm tide is the total observed seawater level during a storm, resulting from the combination of storm surge and the astronomical tide.

Astronomical tides are caused by the gravitational pull of the sun and the moon and have their greatest effects on seawater level during new and full moons—when the sun, the moon, and the Earth are in alignment.

As a result, the highest storm tides are often observed during storms that coincide with a new or full moon.

Powerful winds aren’t the only deadly force during a hurricane.

The greatest threat to life actually comes from the water – in the form of storm surge.

Storm surge is water from the ocean that is pushed toward the shore by the force of the winds swirling around the hurricane.

This advancing surge combines with the normal tides and can increase the water level by 30 feet or more.

Storm surge combined with waves can cause extensive damage. It can severely erode beaches and coastal highways.

The pounding waves can take out boats and buildings.

As the waters move inland, rivers and lakes may be affected, and add to the rising flood levels.

While we can’t prevent storm surge, we do have a system that can warn us of the incoming threat.

As a hurricane develops over the open ocean, forecasters at the National Hurricane Center closely monitor its path to evaluate the risk of a coastal strike.

They use a computer model called SLOSH to predict storm surge heights. The model depends critically on the hurricane’s track, intensity, and size.

SLOSH uses water depths, land elevations, and barriers to the flow of water to compute surges as they move inland.

This data helps determine which areas may need to be evacuated.

When a hurricane slams our coast, it’s important to be aware of all the dangers.

As a reminder, emergency managers want us to run from the water and hide from the wind.

Don’t take unnecessary risks during a storm. Conditions can change in the blink of an eye.

Storm surge is a dangerous event during a hurricane, where furious winds are driving deadly flows of water from our seas to our shores.

Fast Facts

Storm surge is the most deadly part of a hurricane or tropical storm.

Be prepared -- during a storm surge event stay tuned to NOAA Weather Radio or television station and listen carefully for any advisories or specific instructions from local officials.

The Ocean Today website provides access to the current and archived videos that play on the Ocean Today multimedia exhibit. Ocean Today was designed as a highly dynamic, visitor-friendly experience at the Sant Ocean Hall in the Smithsonian Institution's National Museum of Natural History. It has expanded to many other locations around the world.

https://oceanservice.noaa.gov/facts/stormsurge-stormtide.html

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