There actually are tornados in the PNW. Both Washington and Oregon get about 1.7 per year. Here are maps of the tornados here since 1950 for Washington [1] and Oregon [2].
For Washington, in the 134 tornados since 1950 there were 6 fatalities, 303 direct injuries, and $31 million in damages. However most of that was from a single bad year, 1972, which had 4 tornados and all 6 of those fatalities, along with 301 of the 303 injuries. $25 million of the damages were from that year, too.
For Oregon it was 130 tornados since 1950, with 0 fatalities and 5 injuries. $32 million in damages. Like Washington most of the damage came from one year, 1968, with $25 million in damages.
Even though they are rare it turns out that we do have a functioning tornado warning system here. I found this out a few years when my iPhone started blaring a very loud alarm--louder than anything I'd ever heard from it before.
Louder than those about a spotted wanted honda civic?