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2006 storms in Vancouver, Canada
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The November 2006 storms in Vancouver, Canada caused landslides into the city's three main reservoirs. This lead to the water system becoming contaminated far beyond the legal safety limit, and forced the city to implement a boil water advisory for all of Vancouver's two-million residents for more than a week—the largest such advisory in Canadian history. The advisory had a knock-on effect on the local food industry, forcing supermarkets and restaurants to stop selling produce which couldn't be safely washed, and causing the majority of the city's many coffee shops to close. Although no dangerous bacteria levels have been observed, the water was still considered unclean and unsafe to drink, wash vegetables or brush teeth with, without boiling it first for at least 1 minute. Bottled water was in high demand and became scarce in many areas. These storms were caused by an Aleutian Low's steering current, which allowed low pressure areas from the central subtropics of the North Pacific Ocean to track northeast and near areas of British Columbia, sometimes bringing more than 100 mm (4 in) of rain from each low. The low pressure systems were replaced by an Arctic ridge, which caused temperatures to dip to -12°C.
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