The Florida Keys are under a mandatory evacuation order as Hurricane Irma approaches

The main airport has closed, and schools and government buildings are shuttering.
2:00 | 09/07/17

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Transcript for The Florida Keys are under a mandatory evacuation order as Hurricane Irma approaches
Thank you. In Florida tonight, millions of Americans are trying to get out of harm's way. First, the keys of course, only one way in, and one way out. They are very concerned as ginger just mentioned here, about that storm surge. ABC's gio Benitez is right there tonight. Reporter: Tonight, the Florida keys under a full-scale evacuation. The track now has it forecasted to directly impact the Florida keys on Sunday as a devastating major hurricane. Reporter: Some 80,000 residents live here full time, and many, including Elizabeth Prieto, are heeding that warning. I've been through George, been through Andrew, been through Wilma but I'm not staying for Irma. No. Not happening. Reporter: Others, not ready yet. Julie Mcgrane, keeping a close eye on weather reports and stocking supplies. We're planning to stay until the Friday update, and really see where this thing is going to go. And if it's bad, we're going to get out of here. Reporter: Tourists already ordered to leave, and with time to get out running out, drivers rushing to fill their tanks facing long lines, and shortages. This is what we're seeing all over the Florida keys -- out of service. And just look. Chair after chair blocking these gas pumps. They just ran out. But with only one road in and out of the keys, authorities say it could be dangerous to wait. If you stay, and you think you're a tough guy, you're on your own. Don't expect us to come get you. We're not going to put ourselves at risk. This is very different. I have never seen people take a hurricane so seriously. And gio Benitez joins us live from key west tonight, and we should warn everyone at home, don't be fooled by the blue skies because we heard the officials say, don't try to tough this out. The real concern is if there is massive flooding, there's no way to get help in there. Reporter: That's right, David. Let me show you why. Because here you have got just one road in and out of the chis. Take a look at this. You have the water right next Ott road. The average key is just 6 feet above sea level. This is a lot less, so flooding is just a major concern here, David. Really encouraging because you were telling us many are heeding the call to get out. Gio, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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