Why Hurricane Florence is so intense for a storm this far north

Hurricane Florence is whirling off the East Coast of the US with winds reaching 140 miles per hour. Already, mandatory evacuations are planned for communities lining the coast from South Carolina to Virginia, according to CNN.The storm is expected to only get stronger, the National Hurricane Center said in its latest update at 5PM ET: “Florence is expected to be an extremely dangerous major hurricane through Thursday.” That’s unusual, for a storm to be so intense so far north,