Why is San Francisco foggy?

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Tags

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