Cool & Showery All Weekend

Updated Saturday 4:10 p.m.

Showers and thundershowers continue to rock Western Washington as an upper trough of chilly, unstable air moves over the top of us.  We'll see a continued threat of 'rain at times' overnight, with occasional rumbles of thunder, strikes of lightning, or pockets of hail.  It will be locally breezy with gusts to 30 mph.  Overnight lows will drop into the 30s and 40s, so it will be cool and damp out there.

Over the mountains, heavy areas of snow are highlighted by a 'Winter Weather Advisory' for both the Olympics and the Cascades.  With the snow level down to 3,000' (if not a bit lower beneath the heavier showers), both passes will continue to see snow at times.  Three to nine inches of snow may fall over Snoqualmie and Stevens, with up to two feet over the highest peaks.

Sunday will also be wet at times, but not as soggy as Saturday.  Highs will once again hover on either side of the 50 degree mark, which is a bit cool for this time of year.  A stray thundershower won't be out of the question.  Look for increasing clouds by Sunday night...they will be a sign of another stronger system on the way for Monday.  We'll kick off the work week with steady rain and breezy conditions, and highs will top out in the low 50s.

Tuesday will be dry and chilly at first, but yet another round of wet weather swings by Tuesday night into Wednesday.  Highs will hover near 50 degrees, with lows in the 30s and 40s.

Thursday looks dry and chilly.  Lows may dip to freezing early in the morning in the colder pockets, and we may see fog or freezing for for the morning commute.  We may see a few isolated showers, but overall we'll see a break from the rain.  Highs will max out in the upper 40s...brrrr!

Another storm will beat us up a bit on Friday night into Saturday.  We may have another round of thundershowers to contend with by next weekend.

Drive safely!

Meteorologist Shannon O'Donnell
The KOMO 4 Forecast Team