@snow_wizard here is enhanced true color image now... you can see the areas to your south and north at sunset have now merged

Hmm let's see: The last 15 years the WV has had something good after the 20th in 5 of them (2012, 2018, 2019, 2022, 2023), 2 of them being after March 1. Odds go down but not out. Off recency bias that's 33%. None were regional events though so it may be more of a right place right time type of thing.

Not out of nowhere... I checked the visible satellite many times today. There was an area of clouds that moved SW from the Cascades (between Hwy 2 and I-90) starting early afternoon. It moved in here around 4 p.m. and was continuing to spread west towards Bellevue and south towards your area when it got dark. This was at 3:30... just took screenshot of 4-hour loop which still includes daylight hours. It was slowly moving your way at that time.

Hi Todd!