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UPDATE: Extreme avalanche conditions to cause highway closures, danger in alpine

Parks Canada conducting avalanche control in Glacier National Park; avalanche danger rated extreme in area.
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The Canadian Avalanche Centre has issued a rare extreme avalanche danger rating for the alpine on Friday.

The Trans-Canada Highway is closed between Revelstoke and Golden for avalanche control until at least 8 p.m., DriveBC has announced.

DriveBC is reporting that avalanche control will be taking place all day and the highway will be closed until 8-10 p.m. An update is schedule for 6 p.m.

The avalanche danger is rated extreme today in the alpine and high at treeline and blow treeline in the South Columbias, North Columbias and Glacier National Park.

"Very dangerous avalanche conditions exist in the backcountry. Avoid all avalanche terrain!" warns the South and North Columbia avalanche bulletins.

"A large natural avalanche cycle is occurring and the storm is just beginning," warns the Glacier National Park bulletin. "Avoid all avalanche terrain."

A "Pineapple Express" weather system has brought lots of snow, heavy winds and warming temperatures to the region. Environment Canada is forecasting 10-15 millimetres of rain in town today and another 10-15 mm overnight. Freezing levels are expected to rise to 1,600 metres.

Revelstoke Mountain Resort reported almost 20 centimetres of snow overnight and said up to 40 centimetres more could fall by Saturday morning.