Hurricane Dorian threatens Florida as Category 4

ABC News Meteorologist Rob Marciano reports from Melbourne Beach, Florida, on the latest projected path of the storm.
2:23 | 08/30/19

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Transcript for Hurricane Dorian threatens Florida as Category 4
news, hurricane Dorian now a category 2 storm strengthening this morning. Threatening to hit Florida as a major category 4 hurricane. Yeah, let's take a look at the satellite showing Dorian on the move. You see it making its way through the atlantic and here's what the storm looks like from space. You can see the storm is just getting bigger and bigger. Hurricane hunters flying right into the storm capturing this video and here's what we know right now. Dorian could be a category 4 storm when it hits the east coast of Florida sometime on Tuesday, more than 17 million Americans are on alert. The state of emergency in Florida has been expanded to include every county in that state and a dozen counties in Georgia. Of course, our team is spread out all across the storm zone. Our rob Marciano starts us off right there from Melbourne beach, Florida, where they are now bracing for a possible hit. Good morning, rob. Reporter: Good morning, Cecilia. Hurricane Dorian now about 800 miles that way in the open ocean. We have hurricane watches posted for the Bahamas and advisories and watches may very well be posted along the Florida peninsula later today or certainly tomorrow. It's getting more organized and those warm waters, here's a satellite picture. It's a category 2 storm now and on the verge of becoming a category 3 storm, just north of the Turks and caicos islands. 85-degree water temperature so plenty of fuel to fire it maybe a cat 3, cat 4 late tomorrow, Sunday. The timing has slowed down so Monday night into Tuesday morning, cat 4 between ft. Lauderdale or cape canaveral and there's a fair amount of uncertainty in this forecast. The setup is the same. High pressure will nudge it toward the west and our computer models, last night we launched more balloons so in better agreement and more confidence that central or south Florida will get hit hard but will probably go north toward the coastline. High impact, big wind, big rain and storm surge. Highlight that, we want to show you our drone shot. In this part of Florida we have big dunes that protect the atlantic side but we are not too far from the intercoastal waterway and many parts of Florida are surrounded by water on both sides and you can get surge on the other side of this in the intercoastal so that's an issue as you know, Tom, being from this area as we go through time over the weekend. A lot of water, a lot of problems. Yeah, a very wet summer as well. We'll check in with you throughout the show.

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

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