San Francisco is currently experiencing dense fog conditions, which are impacting visibility across the city. The fog is particularly thick in areas near the bay and along the coastline, leading to reduced visibility for drivers and pedestrians. This weather phenomenon is typical for the region during this time of year, as cool ocean air meets warmer inland temperatures, creating foggy conditions. The National Weather Service has issued a fog advisory, urging caution for those traveling in affected areas. The fog is expected to persist throughout the morning hours, gradually lifting as temperatures rise later in the day.