Transcript for Florida, Caribbean prepare as Hurricane Irma strengthens

As that continues new threat, hurricane Irma picking up steam. State of Florida getting ready. Everyone stocking up on supplies, some stores already short on water. First it's going to hit Puerto Rico and ABC's Linzie Janis is in San Juan right in the path of the storm, good morning, Linzie. Reporter: Good morning, George. Residents in Puerto Rico and a long list of caribbean islands are bracing for the worst as Irma is expected to hit as early as tonight. Government officials are ordering people to be ready. This morning, Puerto Rico and Florida residents aren't taking any chances. Stocking up on water, batteries, generators and plywood. Stores struggling to keep up with the demand. Shelves emptying quickly. Ahead of Irma's landfall. I don't want to be stuck out like everyone else is usually late shopping going for last-minute things and there's nothing there in I think everybody is preparing more since what went on in it can and that's why we're here. Reporter: Here's a look at Irma from above. Noaa's hurricane hunter collecting data flying through its eye and in Puerto Rico and the U.S. Virgin Islands FEMA is at the ready with more than 700,000 liters of water and 500,000 meals. The National Guard activated. Schools closed. Cruise ships rerouted. American airlines adding additional flights to get tourists out early. But for the more than 100,000 people who live in the U.S. Virgin Islands like Kansas native Ashley and her family. If you're here you're here at this point. Reporter: They're locking themselves down hoping for the best. You just need to be prepared for flying debris, everything in your house to be completely soaked. Reporter: Here in Puerto Rico the glover governor declaring a state of emergency. The first effects expected with the brunt coming tomorrow. Robin. Want everybody to stay safe. Linzie, hangenithank you. Ginger zee has the latest on

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