Clark County, Southwest Washington much of the Interstate 5 corridor in Oregon will be under an excessive heat watch starting Thursday afternoon, according to the National Weather Service in Portland.
The heat watch runs Thursday afternoon — the Fourth of July — through Sunday evening.
The weather service warns of dangerously hot conditions for the Portland-Vancouver area with temperatures reaching 102 degrees.
Clark County Public Health advises residents to stay indoors in an air-conditioned location if possible, drink lots of non-alcoholic fluids and wear lightweight clothing and sunscreen.