SAN JUAN, Puerto Rico (MCT) — The entire Florida peninsula fell inside Tropical Storm Isaac’s very broad risk “cone’’ on Wednesday but the threat to a string of Caribbean nations was clearer, more immediate and serious.

The biggest concern was Haiti. The capital city of Port-au-Prince, where some 400,000 earthquake refugees still live in tents, sat dead-center in Isaac’s path. Beginning Friday, Haiti and the Dominican Republic could both see a foot or more of rain. Far less has historically triggered deadly flooding and mudslides.