The cross street has been plowed but not the street the bus was attempting to negotiate. Snow fell as pretty light powder, but when it hit the relatively warm road it became heavy, slushy and very slippery. We were sliding around in a 4WD truck with good snow tires. There's enough slope to this street that when the bus tried to start after stopping at the intersection, it just slide downhill into the gutter.
On the way down the hill on the plowed but still slippery street a block from this intersection we were halted by a tow truck (two wheel drive!) which could not make it up the hill and blocked all other traffic. We were barely able to back up the hill ourselves and take an alternate route.
GDB Sonysnow WestHighSchool130111SnowSchoolbus001
From 2013 January Snowstorm