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California Braces for Powerful Storm Expected to Dump Inches of Rain, Pack Hurricane-Force Winds

"It will be all hands on deck."

Men carry sandbags to their vehicles from the Corporation Yard of the South San Francisco Public Works ahead of a powerful storm expected in South San Francisco, California, U.S., on Wednesday, Dec. 10, 2014. Northern California residents are preparing for a powerful storm, starting late Wednesday, that could be the largest in five years prompting the National Weather Service to issue a high wind and flash-flood warning. (Bloomberg/Bloomberg via Getty Images)

Story by the Associated Press; curated by Oliver Darcy.

SAN FRANCISCO (AP) — A powerful storm expected to pack hurricane force winds and heavy rain triggered emergency preparations across Northern California on Wednesday, with residents gathering sand bags, crews clearing storm drains and San Francisco school officials canceling classes for the first time since 9/11.

As much as 8 inches of rain could fall on coastal mountains over a 24-hour period starting late Wednesday, the National Weather Service said.

Men carry sandbags to their vehicles from the Corporation Yard of the South San Francisco Public Works ahead of a powerful storm expected in South San Francisco, California, U.S., on Wednesday, Dec. 10, 2014. Northern California residents are preparing for a powerful storm, starting late Wednesday, that could be the largest in five years prompting the National Weather Service to issue a high wind and flash-flood warning. (Bloomberg/Bloomberg via Getty Images) Men carry sandbags to their vehicles from the Corporation Yard of the South San Francisco Public Works ahead of a powerful storm expected in South San Francisco, California, U.S., on Wednesday, Dec. 10, 2014. Northern California residents are preparing for a powerful storm, starting late Wednesday, that could be the largest in five years prompting the National Weather Service to issue a high wind and flash-flood warning. (Bloomberg/Bloomberg via Getty Images)

Ski resorts in the northern Sierra Nevada could get more than 2 feet of snow before the storm moves through Southern California and to the east with less strength through states including Nevada, Idaho, Arizona and New Mexico. Those states could get rain and snow, but nothing like what California is expected to experience, forecasters say.

"It's a short amount of time for that amount of water," weather service forecaster Diana Henderson said. "We are anticipating some localized flooding, maybe some downed trees and downed power lines. It could have an effect on a wide range of people."

The storm is expected to be one of the windiest and rainiest in five years and could also cause debris slides, especially in areas affected by this year's intense and widespread wildfires. Big waves are expected along the coast.

Public schools in San Francisco and Oakland and some private schools in the Bay Area planned to stay closed Thursday.

San Francisco Unified School District Superintendent Richard A. Carranza said he didn't want to put students at risk, and staff absences and power outages could affect the district's ability to supervise and feed students.

Wind gusts of up to 70 mph were expected on mountain tops, creating possible blizzard conditions in the Sierra. Rain, pounding surf and gusty winds were forecast for Southern California starting Thursday evening.

The weather service issued a high-surf advisory from the Central Coast to Ventura County, saying "waves will over-top jetties and sea walls at times" and "will potentially wash into low-lying beach areas or parking lots."

In California's agricultural heartland, farmers were looking forward to the dousing after three consecutive dry years. Parts of the state have experienced above-average rainfall this year, but not enough to make much of a dent in the drought.

James McFarlane, a third-generation farmer in Fresno County, said workers would have to stop picking citrus crops during the storm, but rain this time of year makes fruit bigger, allowing it to fetch higher prices.

"If we're not getting some Mother-Nature-dictated time off out in the field, that probably means we're going to have a hard time finding surface water in the warmer months," he said.

A man loads sandbags into a van at the San Francisco Department of Public Works corporation yard on December 10, 2014 in San Francisco, California. The San Francisco Bay Area is bracing for a severe storm that is expected to bring high winds and heavy rain that could topple trees and cause widespread flooding. Urban areas could see up to 6 inches of rain in less than 24 hours. (Justin Sullivan/Getty Images) A man loads sandbags into a van at the San Francisco Department of Public Works corporation yard on December 10, 2014 in San Francisco, California. The San Francisco Bay Area is bracing for a severe storm that is expected to bring high winds and heavy rain that could topple trees and cause widespread flooding. Urban areas could see up to 6 inches of rain in less than 24 hours. (Justin Sullivan/Getty Images)

The rain and the snow in the Sierra Nevada fills reservoirs that supply irrigation water during hot, dry months.

In San Francisco, where as much as 4 inches of rain was forecast, crews cleared storm drains and removed loose rocks from a hillside to prevent them from crashing down. Residents were advised to sweep up leaves and debris in front of their properties to prevent them from clogging drains.

"We have crews working starting tonight in 12-hour shifts," said Rachel Gordon, a spokeswoman for San Francisco's public works agency. "It will be all hands on deck."

[sharequote align="center"]"It will be all hands on deck."[/sharequote]

Farther north, a series of strong weather fronts with high winds and heavy rains could lead to flooding and landslides this week in western Washington state.

The weather service expects as much as 14 inches of rain between Monday and Thursday in the Olympic Mountains west of Seattle.

Saturated soils will bring the risk of mudslides, while winds could topple trees.

High winds were also forecast in Oregon.

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