A spring storm began moving out of Southern California on Friday evening, after bringing rain and snow that slowed the morning commute and prompted the closure of some mountain-area schools.
Showers and thunderstorms were expected in the region through Friday night due to a cold and unstable air mass that may linger over the San Gabriel Mountains into early Saturday morning, the National Weather Service said.
In the San Bernardino Mountains, the inclement weather led to the cancellation of Friday classes at all schools in the Rim of the World Unified School District, according to a statement on the district's website.
May snowfall in Running Springs "is not unusual," said Helene Forman, a 12-year-resident of the area.
"We'll take it however we get it. It's beautiful," she said, standing amid the several inches of snow that had fallen overnight. "We need the moisture."
With the storm system comes the possibility of hail, gusty winds and lightning, the Weather Service said. Minor mud and debris flows were possible in recent burn areas.
A lightning strike Friday morning in Pomona damaged a street light and caused a water main rupture, according to the Los Angeles County Fire Department.
The incident happened shortly before 3 a.m. in the 2400 block of Kellogg Park Drive (map), said fire Supervisor Kyle Sanford.
The slight chance of thunderstorms extended over coastal waters, where waterspouts were may occur, forecasters said.
"Landlubbers and mariners alike should be prepared to take safety precautions if thunderstorms develop," the weather service said.