What causes June gloom?



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    June gloom, for those who don’t know, is a southern California term descibing the impact of the marine layer effect.  The marine layer refers to cool air coming off a body of water (usually the ocean), and becoming trapped under the less dense warm air above it.   Typically, the marine layer effect results in cloudy skies blowing in off the coast, usually sometime after midnight (in California).  Under normal circumstances, the grey skies become sunny in the late morning or early afternoon.  Under June gloom circumstances, the gray skies (and possibly fog) do not burn off.  So basically, June gloom is when the marine layer effect has the most effect on the California coast.

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