Seattle is currently experiencing a dense fog that has significantly reduced visibility across the city, including at the iconic Space Needle. This weather phenomenon, typical for the region during this time of year, results from the interaction of moist air from the Pacific Ocean with cooler inland temperatures. The fog is expected to persist throughout the morning, leading to advisories for commuters and travelers, and impacting both road and air travel. Local meteorological reports indicate visibility has dropped to less than a quarter-mile in some areas.