If your LSAT administration was canceled this weekend, you should be getting another email from the LSAC in the next few days; when weather gets in the way of an exam, they try to schedule a make-up test within two to three weeks.
Here are some things you should do if your LSAT was canceled:

Hang on [...]

A storm’s a-brewin’, and the LSAC has already canceled a number of tomorrow’s LSAT administrations. Before you head out tomorrow, check to make sure your test center is open! The LSAC is keeping of running list of centers that are already closed, and that list is sure to grow today and tomorrow.
Here are the closings [...]