Updated Sunday 5:25 p.m.
BBQ's, picnics and memorial services this weekend? Chances are that although we may not have seen the *brightest* weather for such activities, we haven't seen the worst Mother Nature can offer up over a long Northwest weekend, either. We're about two-thirds of the way through our holiday trio, and the weather has been consistently docile so far. Other than a few thundershowers over the eastern slopes of the Cascades, mainly cloudy skies have been the dominant weather feature on this side of the crest. From the coast to the foothills, a stubborn blanket of overcast allowed for only a few peeks of blue Sunday, keeping temperatures in the upper 50s to middle 60s.
Memorial Day itself will be similar. An area of low pressure dropping from Canada and into Eastern Washington will rev up a few more mountain thundershowers, and there is still the lingering threat that a cell or two could wander toward the I-5 corridor. Otherwise, look for the mainly cloudy skies to continue. We may squeeze some morning drizzle out of the low cloud deck closer to the water, especially near the Pacific beaches. Afternoon highs will again stay in the low to middle 60s around Puget Sound--I'd go for jackets over your short-sleeved t-shirt at that BBQ (or, you can really embody the Northwest ideal, and wear flip-flops with your fleece to stay comfortable...!).
Naturally, things warm considerably as we all head back into work and school next week. We'll transition into warmer air by Tuesday, with highs on either side of 70 degrees in Seattle. Thereafter, we'll keep ramping up into the 70s, with a few locales closer to 80 degrees by week's end. The threat for mountain thundershowers remains, so we'll need to watch the rapidly drying Cascade crest for lightning strikes as the week goes on.
Have a safe Memorial Day holiday,
Meteorologist Shannon O'Donnell
The KOMO4 Forecast Team