Seattle is currently enveloped in a dense fog, severely limiting visibility, especially around the Space Needle. This has prompted the National Weather Service to issue a fog advisory, cautioning commuters and travelers to exercise extreme care. The fog, a common occurrence in the Pacific Northwest due to high humidity and cooler overnight temperatures, is expected to persist throughout the morning, impacting both road and air travel. Residents are advised to allow extra travel time, use fog lights while driving, and reduce speed to ensure safety.