Common San Francisco forecast (3)

I believe the answer is:

fog

'common san francisco forecast' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for fog that I've seen before include "Impenetrable mist" , "second growth of grass" , "Miasma" , "Thick mist" , "Heavy mist" .)

I've seen this clue in the USA Today and the Universal.

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