Speculations whipping around South Florida that the Cuban leader, Fidel Castro, is near death reached fever pitch this week as federal emergency officials ran "post-Castro" drills in preparation for the death announcement. Officials described how the demise of the communist dictator could spark their worst nightmares — either a flood of Cuban refugees heading in makeshift boats toward Florida's beaches or a flotilla of Cuban exiles taking off to help liberate Cuba. Anti-Castro Cuban-Americans began planning champagne parties, while local police prepared to close thoroughfares in the event people began to dance in the streets. The expectation of Mr. Castro's...