"Skinner's Sense of Snow"
"Original Air date: 12/17/00"
A huge snow storm hits Springfield and everything is closed, but Springfield Elementary thanks to Principal Skinner. The snow keeps piling up and piling up until eventually the school is trapped in with Principal Skinner and Groundskeeper Willie (them being the only people on the teaching staff that came into school that day). Soon, Bart starts a revolt and the kids take over the school and trap Skinner and Willie. Meanwhile, Homer and Ned Flanders try to save the kids by getting rid of the snow trapping them in.
Guest stars Marcia Wallace as the voice of Mrs. Krabappel.
This is Episode #256 in The Simpsons series. It is Episode #8 in Season 12.