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NEW ORLEANS, La. — Hurricane Ida is continuing to intensify ahead of its expected landfall in Louisiana on Sunday, which is also the 16-year anniversary of Hurricane Katrina hitting New Orleans. The National Weather Service said Saturday that Ida’s ...
The intensity of a hurricane is measured by its maximum sustained wind speed, and when that speed increases by at least 35 miles per hour in a 24-hour period — or roughly two categories on the Saffir-Simpson Hurricane Scale — meteorologists call that “rapid intensification.”
Wind alone does not account for all hurricane-related fatalities. Storm surge and rainfall do as well. Yet the current warning system—the Saffir-Simpson Hurricane Wind Scale—measures a storm's strength solely by wind speed. Subscribe to our newsletter ...
Tropical systems begin as tropical depressions, which are areas of low pressure with wind speeds of up to 38 miles per hour. When those winds strengthen and reach between 39 and 73 miles per hour, the system is upgraded to a tropical storm, at which point ...