Helene is expected to bring flash flooding, strong winds and storm surge.
The NHC predicts that the system will rapidly intensify, likely becoming a hurricane by Wednesday night and eventually reaching Category 3 strength.
Florida Gov. Ron DeSantis has declared an emergency for 41 the state's 67 counties in an effort to expedite preparations and coordination between the state and local governments ahead of the storm's impacts. A tropical storm watch was raised Monday afternoon for Florida's Dry Tortugas and part of the Keys and Monday evening for Bonita Beach to Flamingo, where a storm surge watch is also in effect.
"Strengthening is expected during the next few days, and the system is forecast to become a hurricane on Wednesday and continue strengthening on Thursday as it moves across the eastern Gulf of Mexico," the NHC said in an 11 p.m. advisory Monday. In its Monday 5 p.m. ET forecast discussion the NHC warned that the system's expansion over the record-warm Gulf of Mexico would have far-reaching impacts for the US.
Tropical Storm Helene Hurricane Helene Hurricane Tropical Storm Gulf Of Mexico Gulf Storm 15347750
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