Why is San Francisco so foggy?

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Tags

1. #ocean
2. #rises
3. #especially
4. #pressure
5. #vacuum
6. #climate
7. #three
8. #sides
9. #summer
10. #francisco
11. #creating
12. #moisture
13. #other
14. #hence
15. #surrounded
16. #northern
17. #water
18. #california
19. #filled