Tropical Storm Ian intensifies as it threatens Florida

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Tropical Storm Ian intensifies as it threatens Florida

The National Hurricane Center said Monday that Tropical Storm Ian has strengthened into a hurricane — and warned it could rapidly intensify as it tracks toward Florida.

State of play: Ian — which could turn into a high-end Category 4 storm as early as midweek — was some 315 miles southeast of the western tip of Cuba at 5am ET.

  • Its maximum sustained winds had strengthened to 75 mph, up from 45 mph Sunday afternoon, according to the NHC. A storm is classified as a hurricane when its maximum sustained winds reach 74 mph.
An NWS tweet warning of storm surge flooding along Florida's coast from Tropical Storm Ian.
Photo: NWS Miami/Twitter

Details: A Hurricane Warning was in effect for Grand Cayman and several Cuban provinces, as the storm moved to the northwest at 14 mph.

  • A hurricane watch was issued along the west coast of Florida, including Tampa Bay.
  • A tropical storm warning has been issued for the lower Florida Keys, from Seven Mile Bridge westward to Key West to Dry Tortugas, as well as several provinces in Cuba.
  • A tropical storm watch was in effect for Englewood southward to Chokoloskee in Florida, and the Caribbean islands of Little Cayman and Cayman Brac.

The big picture: President Biden declared a federal state of emergency for multiple Florida counties on Saturday night, and Florida Gov. Ron DeSantis has declared a state of emergency for the entire state.

What to watch: In its 5am update, the National Hurricane Center said Ian was expected to become a “major hurricane” — meaning Category 3 or above — by Monday night when it’s near Cuba.

  • “Storm surge could raise water levels by as much as 9 to 14 feet above normal tide levels along the coast of western Cuba in areas of onshore winds in the hurricane warning area Monday night and early Tuesday,” the agency said.
  • The National Hurricane Center forecast two to four inches of rainfall from the Florida Keys into the southern and central Florida Peninsula from Monday through Thursday

Threat level: Studies show an increase in the occurrence of rapid intensification due to human-caused climate change.

  • The western Caribbean Sea is a powder keg for hurricanes right now, with high ocean heat content and weak upper-level winds.
Tropical Storm Ian's latest projected track, issued at 2am ET Monday by the National Hurricane Center.
Tropical Storm Ian’s latest projected track, issued at 2am ET Monday by the National Hurricane Center. Image: NOAA

What they’re saying: Even if the west coast of Florida doesn’t sustain a direct hit from Ian, “it doesn’t take an onshore or direct hit from a hurricane to pile up the water,” acting NHC director Jamie Rhome said in a Sunday briefing.

  • He urged Florida residents to find out if they’re in a likely evacuation zone at FloridaDisaster.org in case evacuations are ordered.

What’s next: The key questions facing forecasters, public officials and tens of millions of residents along the Gulf Coast are where the storm will head once it becomes a hurricane, and how strong it will be once it gets there.

  • The computer models have been diverging, with some showing a landfall in northwestern Florida or perhaps southeastern Alabama. Others show a hit much farther east, closer to Tampa.
  • Forecast trends since Friday have nudged the most likely track of the center of Ian to the west, closer to the Panhandle region of Florida.
  • While the likelihood of significant impacts in South Florida has decreased, it has not entirely disappeared, and the Hurricane Center is urging all Floridians to prepare for storm impacts.

Context: Human-caused climate change is altering the characteristics of nature’s most powerful storms.

  • For example, sea level rise from melting ice sheets makes a hurricane’s storm surge more harmful.

This story has been updated with the storm’s strengthening and the latest estimates of when the storm is expected to become a hurricane.

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