"Record-Breaking Dense Fog Blankets U.S. in Multiple States"

A record stretch of thick fog has blanketed the Lower 48 states, causing disruptions in flights, vehicle accidents, and school delays. This advection fog, caused by warm, moist air from the Gulf of Mexico being transported over a layer of cold air near the ground, has led to dense fog advisories affecting nearly a third of the U.S. population and parts of 27 states. The fog outbreak is expected to diminish as a storm system sweeps from the Mississippi Valley to the East Coast by the weekend, increasing winds to mix out the soupy air.