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Jacksonville officials are urging people to seek shelter and be at their destination to ride out Hurricane Irma by 8 p.m. Saturday.
Officials said despite Irma's track shifting west, the storm is not only a west coast problem.
"Jacksonville is under serious threat," Jacksonville Mayor Lenny Curry said.
Jacksonville's coast will likely see wind gusts up to 80 miles per hour with sustained winds at 40 mph elsewhere in Jacksonville.
"I want people to stop and think about what that kind of speed means," Curry said. "Imagine something hitting you at 40 mph, and friends, this could go on for 12 hours."
Jacksonville's bridges will close if sustained winds reach 40 mph.
Sheriff Mike Williams said people should anticipate the bridges being closed for up to 12 hours during the storm.
Law enforcement will be at the base of bridges to stop drivers from crossing.
Curry said flooding is the next major hazard. Flash flood watches are in effect for several areas.
Between 3 and 4 feet of storm surge is expected for coastal communities.
Tornado and water spouts are also likely and could begin as early as Sunday.
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Curry said Saturday afternoon that there is still plenty of room at shelters.
He said there will be supplies at shelters but Curry is urging people to bring whatever resources they have with them.
Public transportation including to shelters will end at midnight, Curry said.
MAP, ADDRESSES: Jacksonville-area shelters
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