Hurricane Florence was upgraded twice in one hour's time on Monday.
When the 11 a.m. update was released from the National Hurricane Center, forecasters reported that Florence had stregthened to a Category 3 storm with winds of 115 miles per hour.
At noon, they increased the maximum sustained winds to 130 miles per hour, making it a very powerful and possibly catastrophic Category 4 hurricane, as it moves west, but is expected to take a northwestern turn and head straight for the coasts of either North or South Carolina. Landfall is forecast to happen sometime between late Thursday and early Friday morning.
For Palm Beach County and the Treasure Coast, ocean swells and the possibility of beach erosion are the only things we expect to feel from Florence.
Two other named storms are also being watched by the National Hurricane Center.
Hurricane Isaac is a category 1 storm with 75 mph winds. It is tracking toward Puerto Rico.
Hurricane Helene is a category 2 storm with 105 mph winds. It is forecast to curve north and stay out at sea.
A disturbance in the Caribbean Sea is also being watched closely. It could turn into a tropical depression in the next few days and looks to be headed into the Gulf of Mexico.
Monday marks the climatological peak of the hurricane season.
Map: National Hurricane Center