Weather we should run or not

The weather totally sucks. But oh well. I live in western Washington. The weather is going to suck at times. It's a fact. But we generally don't get a ton of snow. So what if I am going to run 6-7 hours in the snow tomorrow, or rain, or snow at the top. It will be an epic day of running in the woods. 34 miles and over 21,000 feet of elevation change will make for a fun day no matter what. At least I shouldn't (repeat - shouldn't) run out of water. Osmosis will work also. Or I can just eat the snow at the top.