Answer: SORRY FOR TAKING TOO LONG
Fog is the kind of weather that usually forms over the northwest United States in the summer because of maritime polar air masses. Maritime polar air masses are cool and moist, and when they move over the relatively warmer waters of the Pacific Ocean, they can pick up moisture and become even more humid. When this humid air reaches the cooler air over the land, it can create fog, which is common in the coastal areas of the Pacific Northwest during the summer months.