Models have continuously overdelevoped ridges in the 120-240hr range over the last couple months. I doubt tonight's GFS and CMC are starting any new trend.
With today's underperformance, KSEA exactly doubles its April 2024 rainfall total, adding another 0.43" to the bucket and filling it gently to an even 0.86"... Pending some stray stratoform rainbands over the next day.
Tomorrow will clear earlier than modeled over the Sound with a mostly-dissipated occlusion front overhead and weakly negative low level lapse rates. Any residual stratus should be digested mighty well by that steamin' late April sun, mixing skies into hazy sunshine before noon. I'm going for a gutsy 64/47 day at KSEA. Might even get a bit muggy, some CAM's have dewpoints pushing fifty in the favored sheltered areas, despite what I claim to be too much modeled cloudcover.