Why Ida’s storm surge potential should worry coastal communities
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While many people focus on the wind speed of storms, the danger often comes from the water flowing in from the ocean.
Privately, you may be wondering (and you wouldn’t be alone): “What exactly is storm surge?”
“A storm surge is a rise in water level caused by a strong storm’s wind pushing water on shore,” said CNN meteorologist Brandon Miller. “The wind literally piles up the ocean water and pushes it on the land.”
All that water has nowhere to go
Storm surge also can exacerbate flooding. As the water piles up along the coast, rivers and streams that typically drain into the ocean can become clogged farther upstream, forcing water levels to rise.
Ida could leave some parts of southeast Louisiana “uninhabitable for weeks or months,” according the to the latest hurricane statement from the National Weather Service.
That water doesn’t just leave. Depending on how much water was pushed ashore and the area’s watershed, it may hang around, causing further damage to communities.
Due to climate change, storm surge has become an even greater threat in recent years.
“Sea levels have risen in most places by about 1 foot over the past century. The higher baseline ocean level allows storm surges to reach even higher, increasing their destructive capabilities,” Miller said.
CNN’s Brandon Miller, Gene Norman, Judson Jones, Emily Smith and Kelly Murray contributed to this report.
