After Florence makes landfall, that ridge, now over Washington and NY, will move east - but be replaced by another one forming over the Great Lakes that will likely keep the storm stuck, McNoldy said.
Hurricane Florence is a Category-4 storm that's headed for the US East Coast and predicted to start impacting SC and North Carolina as early as Thursday morning, according to the National Hurricane Center.
A National Weather Service satellite monitoring Hurricane Florence has recorded a wave reaching 83 feet in the storm churning in the Atlantic Ocean. Stormhunters Jaclyn Whittal and Mark Robinson will be LIVE in the Carolinas with the latest.
Hurricane Florence has been downgraded to a category two, but it is still on track to cause significant damage in the US.
Across several eastern states, residents scrambled to leave as the Category 4 storm, with winds of 225kmh, approached.
Hurricane Florence seen from the International Space Station.
Early Wednesday afternoon in North Carolina, the storm was centered 700 kilometers (435 miles) off the coast, moving at 26 kph (16 mph) towards the U.S. coastline. But one thing it might actually help is to reduce the overall wind speed, though we're still going to have gusty winds around here which combined with that wet soil could bring down some trees.
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Hurricane Florence put a corridor of more than 10 million people in the crosshairs Wednesday as the monster storm closed in on the Carolinas, uncertainty over its projected path spreading worry across a widening swath of the Southeast.
Duke Energy, which says 1 to 3 million customers could experience power outages because of Florence, moved power restoration crews from other states including Indiana, Ohio, Kentucky and Florida to the region with hopes of addressing any power outages that occur as soon as possible.
Georgia Governor Nathan Deal issued an emergency declaration for all 159 counties in his state.
Florence is forecast to dump up to one metre of rain in some areas after it makes landfall in North and SC. It may move a little north into Virginia or a little south into SC. All seven of North Carolina's ferry routes were shut down.
Officials in New Hanover County, which includes Wilmington, have stockpiled enough food and water for 60,000 people for four days, along with more than 28,000 tarps. Shelters in the city were filling and some people were being bused inland to Raleigh, even though some residents there were told they might have to evacuate.
It has Hanover County Commissioner Woody White very anxious.