How sea level rise made Idalia’s storm surge worse

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How sea level rise made Idalia’s storm surge worse
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Rising oceans substantially worsened the devastating storm surge that Hurricane Idalia flung at the Florida coast on Wednesday, according to scientific experts and data analyzed by The Post.

While a higher mean sea level means higher hurricane storm surges, simply calculating how much the sea level has risen underestimates some of the effect, Kirtman said. That’s because “you cross thresholds,” he said.

“If your house is at eight feet, you’re on Cedar Key and on stilts, the house might not flood if the tidal flooding is at seven feet,” Kirtman said. “But eight feet is a big disaster. So the additive effect of nine inches is a huge impact in terms of localized damage.”This threshold effect may be even more noticeable in places that saw a lower storm surge than Cedar Key, such as St. Petersburg and Tampa. At the St. Petersburg tide gauge, preliminary data suggests the storm surge reached 3.

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