course, very important, have a spare or alternative power supply for your cell phone, david. alex perez in miami for us tonight. alex, thank you. and this evening, into the evening hours, in fact, some of the islands already in irma s path. puerto rico gets hit tomorrow, and they are expecting the worst storm there in nearly a century. abc s linzie janis with the urgent effort tonight to get prepared in san juan. reporter: tonight, with irma s eye bearing down on the caribbean, the last sandbags are being filled and the shelves being cleared out. the hurricane could bring waves up to 23 feet. fishermen in antigua, pulling boats to safety. the time to prepare is over. the island, the first in line to feel irma s effects. its airport shutting down with a prayer, may god protect us all. puerto rico also in irma s path. the national weather service says it hasn t seen a storm of this magnitude in nearly 100 years.