23 December, 2013 08:55

A cold, unstable upper trough will follow a departing frontal system today. A return to a drier, colder, northwesterly flow will occur tonight with an upper ridge building over the Coast. This upper ridge will flatten as the next system approaches and a fairly moist plume will be directed at the White pass area, southwards over the Panhandle to the North Coast with heavy precipitation likely. This system will slump southwards later in the week with moderate precipitation likely for the central coast, and spillover affecting the Northern Rockies to the Columbias. Moderate precipitation is likely in those areas. Confidence is reasonably high: the GFS, GEM, and ECWMF show similar progressions with generally heavier precipitation for the coast and moderate for the Interior.

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