saying local officials expected “the possibility of flooding and even spinoff tornadoes in portions of Alabama.” In Mississippi, Gov. Tate Reeves also issued a state of emergency on Saturday, allowing for the use of state resources for response and recovery.
Research over the past decade has found that, on average, such rapid intensification of hurricanes is increasing, in part because the oceans, which provide the energy for hurricanes, are getting warmer as a result of human-caused emissions of greenhouse gases. But Ida will also strengthen quickly because the Gulf, as is usual at the end of the summer, is very warm.
The hurricane center defines rapid intensification as at least a 35-m.p.h. increase in sustained winds over 24 hours. In the extremely active 2020 season, Hurricane Laura intensified by 45 m.p.h. in the 24 hours before making landfall in Louisiana as a Category 4 storm in late August.
The National Hurricane Center said Ida was likely to produce heavy rainfall late Sunday into Monday from southeast Louisiana to coastal Mississippi and Alabama. Tropical storm force winds will arrive along the coast as early as Saturday night, according to the National Weather Service, before the storm makes landfall on Sunday afternoon or evening. After moving inland, the storm could contribute to flooding in Tennessee, where flash flooding killed 20 people last weekend.
“Based upon current track and strength of Ida, this storm will test our hurricane protection systems in a way they haven’t been tested before,” Chip Kline, executive assistant to the governor of Louisiana for coastal activities, said on Twitter. “It’s times like these that remind us of the importance of continuing to protect south Louisiana.”
Because of an editing error, an earlier version of this article misidentified the location of Tropical Storm Ida. It was in the Caribbean Sea early Friday, not the Gulf of Mexico.