Southern California’s March rain is a welcome relief, coming as it does after a mostly dry January and an absolutely desiccated February. Los Angeles, like much of the rest of the state, had been in drought and was getting by without severe conservation measures only because of reservoirs still brimming from the soaking winter of 2017 and a succession of moderately wet follow-ups.

We have a name for late winter storms that come at the end of mostly failed rainy seasons. We call them March Miracles. The granddaddy of them all came in 1991, when California was facing a desperate water shortage only to be hit by a late-March Sierra blizzard that packed a whole season’s worth of moisture into three days.