Be advised of patchy areas of dense fog currently forming along portions of the coastal areas of San Diego County, with visibilities being reported less than a quarter of a mile at San Diego International (Lindbergh Field) within the past hour. Portions of I-5 may also be inundated with patchy areas of dense fog, with poor visibilities. Be sure to stay alert, and give yourself plenty of braking distance. Conditions should improve shortly after sunrise.