What causes the May gray that stubbornly blocks the sun for days in Southern California?
Briefly

(Myung J. Chun / Los Angeles Times)

Sunny Southern California has not been so sunny lately, with gray skies casting a dreary shroud over the region.What causes the stubborn low clouds that muscle out the sunshine day after day?To start with, the cloud cover is a function of the season.In May and June, the upper atmosphere is more stagnant.
Read at Los Angeles Times
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