The National Weather Service issued a tornado watch until 4 a.m., local time, for parts of North Carolina as Tropical Storm Idalia makes its way through the area.

Many people will be able to observe and take photos of Wednesday night's rare blue supermoon, but those impacted by Hurricane Idalia may experience worse tidal flooding because of the supermoon.

A blue moon refers to the second time a full moon appears during the same month. A supermoon is when it is at the closest point in its orbit around the Earth, according to NASA.

Both high and low tides are more intense with a supermoon because of the moon's gravitational pull on the oceans, according to NASA.

"Perigean high tides during a full moon and new moon can cause major problems on some coasts, especially if weather adds high waves or a storm surge," NASA said.

Areas in Pasco County, Florida to St. Petersburg, Florida, experienced flooding after Idalia made landfall on Wednesday as a Category 3 hurricane.

ABC News Chief Meteorologist Ginger Zee predicted flooding may occur in Savannah, Georgia, and in Charleston, South Carolina, as Idalia, now a tropical storm, makes its way through the region.

The National Weather Service (NWS) in Charleston, South Carolina, said water has breached the Charleston Battery and dunes at Edisto Beach -- flowing onto roadways and into downtown Charleston.

High tide is coming shortly as well, which will compound the impacts. The NWS said the tide is "already in the top 8 of peak tides on record" -- and rising.

-ABC News' Kenton Gewecke

Here are some preliminary rain, wind and storm surge numbers from Idalia so far, as of 5 p.m.:

-Highest reported rainfall total: 9.4 inches in Clearwater Beach, Florida

-Highest wind gusts: 85 mph gusts in Perry and Bucell Junction, Florida

-Highest reported storm surge: Nearly 7 feet in Cedar Key, Florida (setting a new record at this gauge; the old record was 6.1 feet during Hurricane Hermine in 2016)

-ABC News' Daniel Peck

Gov. Ron DeSantis said there is "significant damage" throughout the Big Bend region, with Columbia, Madison and Dixie counties hardest hit.

"There is, of course, a lot of debris to clean up. But we will get working with that with the local communities to make sure that the roads are cleared and people can go back to their lives," DeSantis said during a press briefing.

As of 6 p.m. there is one unconfirmed fatality due to the storm involving a traffic incident that the Florida Department of Law Enforcement is reviewing, the governor said.

"That may end up being a confirmed fatality, it has not been confirmed yet," DeSantis said.

Thirty of the 52 school districts that closed due to the storm will reopen Thursday, and an additional eight will reopen on Friday, the governor said.

-ABC News' Hannah Demissie and Will McDuffie