With 60 mph wind gusts, drifting snow will be a problem.
You mean possibly at time way up north. Here around Boston we often have high gusts (over 40 just last week), and had over 100'' of snow in one month in 2015 in densely packed cities,. And for years I delivered milk amid heavy storms, so I know of the rush, including after the great (surprise) blizzard of '78 ( 27.1 new inches, plus a few already there, during rush hour=over 3k cars and trucks stranded on the highway). Sustained winds of 86 mph were recorded in eastern Massachusetts, and unusual thundersnow to southern New England and Long Island
After that i heard that the National Guard commander flew in from Buffalo (which in 1977 had a record 199.4 inches of snow) and reportedly said something like, "What the big deal?" Well, pop. congestion for one thing, and 200 National Guard troops helped enforce martian (I mean martial) law.
So there are more factors other than just snow depth, but the point is that if Seattle regularly saw lots of snow then the panic would be minimal.