Sadly, Oregon has some of the most unpredictable weather patterns known to man.
Last weekend down here on the coastal area, where I live, we had the following:
Thunder
Lightning
Sleet
Hail
Snow
Rain
And, during the rain, thunder, and lightning, I could also see the Sun shinning down. It takes awhile to get used to the crazy weather. I was born and raised in Oregon, and I still am not fully used to it.
I have learned, however, never to trust local weather forcasts.