Updated: Saturday, 5:20 p.m.
After a warm pair of spring days on Thursday and Friday, our pattern was back to the ol' familiar on Saturday, as temps cooled down and showers alternated with sunny breaks. Highs made it mainly into the upper 50s and low 60s, so even though we cooled down quite a bit, the temperatures are still running a bit warm compared to average (which is 56 degrees for late March in Seattle).
A new frontal system is steering toward British Columbia, and the warm frontal portion of it is inching into the region tonight. The clouds will increase for all of us, but most of the overnight rain will stay near the ocean beaches, the Strait, and through the NW Interior. Early Sunday morning lows will bottom out in the upper 40s to low 50s.
On Sunday, that frontal system will continue to lift north into Canada, so the closer you are to the border, the better chance you'll get wet. Everett on north to Bellingham should certainly see some light rain at times, and those south of Olympia will probably stay dry. Afternoon highs will again top out on either side of 60 degrees.
Monday will be dry and partly sunny most of the time, but look for increasing clouds Monday evening--a sign of the rain to return after dark. A damp overnight will be followed by a cool and unsettled Tuesday,and we'll probably end up with some stray thundershowers with hail and locally gusty winds beneath them. Temps will fall back into the middle 50s.
Wednesday and Thursday should be a bit quieter, with just a few isolated showers possible, but another round of rain followed by thundershowers looks like it will take aim on the Northwest by Friday and Saturday.
Have a great night!
Meteorologist Shannon O'Donnell
The KOMO4 Forecast Team