Pay no mind to the fact that Memorial Day is around the corner — winter is here again. Across California, yet another May storm on Sunday brought cool temperatures and rainfall throughout Southern California, hail in the Bay Area and even snow in the Sierra. “This is May gray on steroids,” said Bill Patzert, a local weather expert and former climatologist with Jet Propulsion Laboratory. “Usually by this time of year, we’re done, but this meandering jet stream has been persistent through the spring, and it’s given us four times our normal rainfall.”