As the February 2013 LSAT approaches, a blizzard is striking the East coast. The LSAC rarely cancels tests, but this year the storm is severe enough that testing has been suspended at a few test centers.
Odds are, your test center is not affected. Be sure to monitor the official notice of cancellations here:
The LSAT does not appear to have announced what happens if your test is postponed, but from past experience they will contact you to schedule a retake in 1-3 weeks. If that happens to you, continue practicing as usual: timed practice tests are the best way to prepare at this point.