King, in the Notes section in Skeleton Crew, says The Mist was inspired by a real-life experience, when a massive thunderstorm much like the one that opens the story occurred where King lived at the time. The day after the storm, he went to a local supermarket with his son. While looking for hot dog buns, King imagined a "big prehistoric flying reptile" flapping around in the store. By the time the two were in line to pay for their purchases, King had the basis for his story: survivors trapped in a supermarket surrounded by unknown creatures.
While experiencing the unusual spring weather which precedes the storm, some characters make reference to the real-life Great Blizzard of 1888, which devastated much of the northeastern United States.
