Florence, a Category 4 hurricane, is less than 48 hours from making landfall on America's southeastern coast, where more than a million people have been ordered to flee their homes.
"This is a no-kidding nightmare coming for you", he added.
Hurricane Florence, the first major hurricane in the Atlantic basin this season, will be slamming into the Eastern United States this week as a Category 4 hurricane.
Gerst photographed the storm 400 kilometers, or 248 miles, above the eye.
The US National Hurricane Centre has warned that Hurricane Florence will bring "life-threatening, catastrophic flash flooding" to North and SC.
CBS’ Les Moonves quits after new sex misconduct charges
CBS will pay ousted chief Les Moonves $120 million if its ongoing investigation fails to find any evidence of sexual misconduct. Shari Redstone-controlled NAI will also consider in good faith any other deal suggested by those unaffiliated directors.
Hurricane Florence as seen from the International Space Station on Monday, September 10, 2018. Forecasters said Florence could become an extremely risky major hurricane sometime Monday and remain that way for days.
The NHC says the storm may push a "life-threatening" surge of seawater ashore into these and other areas.
Hurricane Florence, a powerful Category 4 storm, could stall upon reaching the Carolina coast and make a slight shift south toward SC once it makes landfall, becoming "a major flooding event", according to Fox News Senior Meteorologist Janice Dean.
When the space station flew over the storm's menacing eye, Gerst took this photo.
More than 1.4 million people across North and SC have been ordered to evacuate as President Donald Trump vowed the federal government was "ready for the big one".
This enhanced satellite image made available by NOAA shows Tropical Storm Florence, center, in the Atlantic Ocean on Saturday, Sept. 8, 2018 at 2:45 p.m. EDT.