Light rain blanketed much of the Los Angeles area Sunday, but the fast-moving storm was expected to taper off this evening, with only a slight chance of showers after midnight.

The system began with light rainfall Saturday in far-western Los Angeles County near the Ventura County line, National Weather Service meteorologist Kristen Stewart said.

Sunday’s rainfall was expected to drop a quarter- to a half-inch of rain before a break on Monday. Another storm system could bring showers back to the area by Tuesday night.

“It is unusual to have multiple storms in May,” Stewart said. She attributed the weekly or biweekly systems to the Jet Stream, which usually shifts to Washington state and Oregon in May. However, the Jet Stream has remained over Northern California and the Oregon border, causing cold fronts to dip to Southern California.

The weak El Nino “tips the scale in favor of rain” but is not the sole cause, she said.

The mountain snow levels were expected to be between 5,500 and 6,500 feet Sunday, with accumulations of 1-6 inches, she said.

Los Angeles County’s health officer, Muntu Davis, extended a water-use advisory until 8:30 a.m. Wednesday for all county beaches. The public is urged to avoid swimming, surfing, and playing in ocean waters around discharging storm drains, creeks, and rivers.

Bacteria, chemicals, debris, trash, and other public health hazards from city streets and mountain areas are likely to contaminate ocean waters at and around these outlets after a rainfall, officials said.

Monday’s temperatures could warm to the upper 60s to low 70s, Stewart said.

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