By Sharon Bernstein
SACRAMENTO, Calif., Feb 28 (Reuters) - A large winter storm brought much-needed relief to parched California on Friday, boosting depleted reservoirs and the Sierra Nevada's mountain snowpack, but officials said the precipitation would be too little to offset years of drought.
The heavy rains also prompted flash flood warnings across much of Southern California and posed a particular threat to foothill communities where recent wildfires stripped vegetation from large areas, leaving homes below vulnerable to potential mudslides.
Mandatory evacuations were in effect on Friday for more than 1,200 homes in some slide-prone areas east of Los Angeles, where sandbags were stacked around driveways and miles of concrete barriers were lined up along the streets to channel heavy hillside runoff away from houses.
The downpours even posed challenges to crews preparing for Sunday night's Oscar ceremony in Hollywood, soaking parts of the newly installed red carpet.
California is in its third year of a dry spell that may break all records in the most populous U.S. state, where lawmakers on Thursday swiftly passed a series of drought relief proposals to Governor Jerry Brown for his signature. President Barack Obama has also pledged millions of dollars in aid.
Friday's storm, and a smaller band of showers on Wednesday, came as a welcome break in California's relentlessly dry weather but will do little to significantly ease the state's water crisis.
"Despite these recent storms, it would still have to rain every other day until around May to reach average precipitation totals, and even then we would still be in a drought due to the last two dry years," said Richard Stapler, spokesman for the California Natural Resources Agency.
Brown declared a drought emergency last month and has called on state officials to prepare for water shortages and to develop solutions for potentially long-term dry weather.
Officials have said that California farmers facing drastic cutbacks in irrigation water are expected to idle half a million acres of cropland this year in a record production loss that could cause billions of dollars in economic damage.
Moderate to heavy rainfall across Southern and Central California on Friday was expected to taper off by Saturday afternoon, the National Weather Service said.
The coastal town of Oxnard, just north of Los Angeles, received nearly 2 inches (5 cm) of rain by late afternoon, the highest precipitation measured anywhere in the United States during the day, according to the weather service.
ROCK SLIDES AND RIVER RESCUES