ADVISORY: Even Bigger Storm Coming This Weekend?

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Just when you thought the worst was over comes this brand spankin’ new Winter Weather Advisory (as of 4:58 12/18/08)  from the National Weather Service – basically, another, even more powerful storm is coming this weekend, with snow, sleet and lots of wind:

… Major winter storm should impact western Washington from late Saturday afternoon through Sunday…

After the current round of snow showers is gone… the next weather system to impact western Washington will arrive on the coast on Saturday afternoon and spread inland on Saturday night. This system will contain a lot of moisture and should bring a wide variety of winter weather conditions to all of western Washington.

Perhaps the most significant impact will be potentially destructive winds in the Cascades and the east Puget Sound lowlands. See the high wind watch issued by this office.

This system will contain a lot of moisture as it spreads over the cold air mass in place. Precipitation should first start in the form of snow as it spreads inland. Heaviest snow amounts should take place along the central coast… in the lower Chehalis valley… over the Kitsap peninsula and the southwest interior.

Snowfall totals could exceed 6 inches for many locations with a few locations reaching a foot in a few places. Strong east winds could then cause blowing and drifting of snow.

Elsewhere… including the Seattle-Tacoma-Everett corridor… snow accumulations are expected but amounts will be less.

Later Saturday night and Sunday morning… a layer of warm air aloft will overspread sub-freezing air at the surface. This could cause snow to mix with or change to sleet and freezing rain… mainly south of a line from Ocean Shores to Everett. If more precipitation falls in the form of freezing rain as opposed to snow… then significant icing in excess of one-quarter inch would be possible in these areas. Ice accumulations of this magnitude can cause power lines to snap… bring down large tree branches… and cause widespread travel disruptions.

Temperatures on Sunday afternoon are forecast to rise a little above freezing for most of the western Washington lowlands… so the threat of freezing rain would end at that time.

This has the potential to be a significant winter storm for much of western Washington. Many of the exact details remain uncertain… so check back for the latest forecasts… watches and warnings as the details of this event become more solid.

Regardless of the details… be prepared for winter weather and significant weather-related disruptions this weekend starting Saturday afternoon.

Note how the forecast mentions “south of a line from Ocean Shores to Everett”?

Here’s a map of that line, and notice where Burien is located:

So…are you ready for this one?

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