Tropical storm Isaac threatens Haiti with up to 12 inches of rain – CNN's Gary Tuchman reports from Port-Au-Prince on the challenge of alerting residents – Early Start with John Berman & Christine Romans

(CNN) – Tropical Storm Isaac marched toward Haiti on Friday, posing a danger to the nation nearly three years after a devastating earthquake left hundreds of thousands living in camps. Isaac is expected to whip the Caribbean nation with gale-force winds and stinging rain. A National Hurricane Center forecast map shows the storm making landfall … Continue reading Tropical storm Isaac threatens Haiti with up to 12 inches of rain – CNN's Gary Tuchman reports from Port-Au-Prince on the challenge of alerting residents