Gary Dunkle wrote, "That has to win the 'Quote of the Day Award,' Dale!"
Add, "Dieing slowly from cold and wet can ruin your whole day."
I nearly lost a friend who capsized a whitewater dory in the North Fork of the Skykomish River during spring runoff, with a water temp in the mid 30F's. He got stuck in the seat ropes and rode down the river clinging to the chine. By the time he got loose and was rescued, he was totally out of it. He was wrapped in a blanket and placed in front of a truck heater going full blast. He was puking and shivering violently and barely coherent. I've seen people get a little clumsy and stupid (yes, more than usual), but this was scary stuff. Believe me, you don't ever want to go there.
Comparing weather in different parts of the US is interesting to me. The recent tornado disaster in OK certainly comes to mind, the southern deserts, the cold of the northern states, the massive snowstorms of the NE, lightening in the Rockies, massive hail storms, etc. In the PNW, we get an occasional winter wind storm and high snowfalls in the mountains, but with mild temperatures and weather that is typically much less violent, I think we lose respect for what can happen to the unprepared.
Hypothermia is a sneaky killer and it can happen at seemingly mild temperatures. IMHO, trekking without effective rain gear and suitable layering is risky business here in the PNW. The potential for getting wet and STAYING wet for long hours or days is very real. With no direct sunlight and high humidity, the chance of drying insulation is less than zero-- it will get wetter yet! Those stories about spreading out a sleeping bag on brush to complete drying are about as exotic to me as tales of travel in the desert or the Himalayas. Saving weight is wonderful, but I'm not going to risk my life for the weight of a basic rain jacket.
This is what 100"/year rainfall looks like: