It is a hurricane tonight and it's expected to be a major hurricane when it hits the

U.S. mainland.

John Berman here in Ferrand or Sin and yes, President Trump has indeed tweeted something

insensitive and obnoxious about the Americans in Puerto Rico now being side-swipe by Hurricane

Dorian, more on that shortly.

First, just seconds ago, we got a new update from the National Hurricane Center, which

means brand new and troubling details about just how big the storm is, how big it will

get, and just where it's headed.

CNN meteorologist Alan Chinchar joins us now.

Allison, I understand the headline here is getting stronger.

Yeah, and you can see that both when you look at the satellite images and then also when

you read the numbers, the most significant thing is it had a big drop in pressure going

from 9.97 down to 9.90.

This may not sound like that important, but that's a big drop for a tropical system in

a short period of time.

Winds are still at sustained at 80 miles per hour, gusting up to 100 miles per hour, but

the key is that it's now moving entirely over open water.

That is fuel for a storm like this, which is why we're seeing it intensify.

Also now, we're beginning to see that eye wall begin to take shape.

That is also another indication that the storm is strengthening.

Here's the thing that you don't often necessarily see that at night.

It needs the sun.

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