South Florida grappled with the aftermath of Tropical Storm Issac on Monday. Flood watches and wind advisories remained in effect for Miami-Dade and Broward counties, and schools remained closed there and in the Florida Keys, which were hit the hardest by the storm. The storm dumped plenty of rain on the region Sunday and ravaged it with high winds, leaving tens of thousands without power and forcing the cancellation of 142 flights at Miami's airport plus more at Fort Lauderdale's. On Monday, as south Floridians were still picking up from the storm, Isaac was getting a little better organized as it continued to move through the eastern Gulf of Mexico. Forecasters expected that it could become a hurricane Monday or Tuesday and land somewhere between the Florida Panhandle and metro New Orleans on Wednesday, the seventh anniversary of Hurricane Katrina.