A storm blowing across Maine on Tuesday was expected to drop a couple inches of snow across the state, a day before temperatures were likely to plunge just ahead of Thanksgiving. As Mainers hit the road for the holiday, a meteorologist warned of slushy conditions on Tuesday afternoon and poor visibility when an arctic front arrives late Wednesday. About 54.3 million Americans were expected to hit the road this Thanksgiving holiday weekend, up 4.8 percent from last year and the greatest volume since 2005, according to AAA. [Subscribe to our free morning newsletter and get the latest headlines in your inbox] “Just be aware that when the arctic air initially comes in Wednesday evening, there could be a brief period of blowing snow that could result in localized whiteout conditions in open areas as wind initially surges in,” Mark Bloomer of the National Weather Service in Caribou said.