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As the world warms from the burning of fossil fuels, the globe will see both more extremely intense storms like Mangkhut and wetter storms like Florence, Vecchi said.
Warmer than normal sea temperatures to add energy and rain to a storm. Check. A wind pattern that allows a storm to get strong and stay strong. Check. Higher sea levels to make a storm surge worse. Check. A storm covering enormous area, to drench and lash more people. Check.
Florence rapidly strengthened into a potentially catastrophic Category 4 hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week.