This is a huge system and its wind field will continue to grow, that is why we will feel tropical storm force winds over South Florida through Friday at least. Pockets of heavy rain will move in and out until Saturday. The main impacts will be at the beach with choppy seas, strong winds, beach erosion, some street flooding and the threat of rip currents. Boating is not advised until Sunday.
The forecast cone calls for Sandy to weaken as it travels north over the Western Atlantic but by early next week it could nudge back to New England as a depression impacting them with rain, rough seas, and breezy conditions.
This is from NHC:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WARNING IS IN EFFECT FOR... * CUBAN PROVINCES OF CAMAGUEY...LAS TUNAS...GRANMA...SANTIAGO DE CUBA...HOLGUIN...AND GUANTANAMO * THE RAGGED ISLANDS IN THE SOUTHEASTERN BAHAMAS * THE CENTRAL BAHAMAS * THE NORTHWESTERN BAHAMAS A TROPICAL STORM WARNING IS IN EFFECT FOR... * HAITI * FLORIDA EAST COAST FROM OCEAN REEF TO FLAGLER BEACH * LAKE OKEECHOBEE * THE REMAINDER OF THE SOUTHEASTERN BAHAMAS A TROPICAL STORM WATCH IS IN EFFECT FOR... * FLORIDA EAST COAST FROM NORTH OF FLAGLER BEACH TO FERNANDINA BEACH * FLORIDA UPPER KEYS FROM OCEAN REEF TO CRAIG KEY * FLORIDA BAY