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A major storm system will bring heavy mountain snow and coastal showers to the northwestern U.S. this weekend. 

ENDANGERED SEABIRD AT HAWAII VOLCANOES NATIONAL PARK CAUGHT ON CAMERA FOR FIRST TIME

Widespread heavy rain and snow are expected across much of the Northwest and northern California

Snowfall totals at high elevations will range from 6-12". 

Forecast high temperatures

Forecast high temperatures on Friday across the country (Credit: Fox News)

The highest snowfall totals are expected in California's Sierra Nevada, where several feet of snow could fall. 

Winter weather advisories have been issued through the weekend. 

Winter weather alerts in the West

Winter weather alerts in the West through Sunday  (Credit: Fox News)

For coastal communities, as much as 3 inches of rain is expected. 

Winter weather advisories remain in place Friday for the portions of the Plains and Midwest

Midwest, Plains winter weather alerts

Winter weather alerts through Friday afternoon in the Midwest, Plains (Credit: Fox News)

Moderate snow with gusting winds can be expected from South Dakota to Chicago. 

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Meanwhile, winter storm warnings have been issued for north central Iowa where the winter storm will be strongest.