Friday, November 19, 2010

Snowfall Alert For Nanaimo

The Following Snowfall Warning Is In Effect

The Weatheroffice of Environment Canada has issued the following snowfall warning as of 11:00 pm PST Friday Nov. 19, 2010:
5 to 10 cm of snow tonight.

This is a warning that significant snowfall is expected or occurring in these regions. Monitor weather conditions..Listen for updated statements.

A building Arctic ridge of high pressure over the British Columbia interior is producing strong outflow winds through the coastal valleys of the province and as a result cold air has pushed out to the coast. This cold air is forecast to combine with a low pressure system off Vancouver Island tonight to produce the first widespread snowfall of the season.

5 to 10 cm of snow is forecast for metro Vancouver, East Vancouver Island, Greater Victoria and the Southern Gulf Islands with the highest amounts over higher terrain. Locally higher amounts are also possible along East Vancouver Island where outflow winds will pick up moisture over the strait of Georgia.

The strong northeasterly outflow winds are expected to rise to 90 km/h with gusts to 110 over the Central Coast - coastal sections and up to 70 km/h with gusts to 90 over the southern sections of Howe Sound this evening.

The Arctic airmass will also combine with the strong northeasterly outflow winds to produce low windchill values below minus 20 degrees over the inland sections of the north and central coast. The strong winds and cold windchills are expected to moderate later Saturday as the Arctic ridge and the pacific low weaken.


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