Thanks to Adam Lebow for sending this in:

UPN 33 in Miami/Fort Lauderdale has announced that is has moved the broadcast of WWE SmackDown from 8pm tonight (Thursday), to 4pm on Saturday, as CBS 4/UPN 33 are both simulating news broadcasts for Tropical Storm Katrina.

Not sure about the UPN/WB affiliate out of West Palm Beach, although I would assume they would be doing something similar.