A critical moment for Tropical Storm Dorian is just hours away

Tropical Storm Dorian poses the first big threat of the hurricane season to the Caribbean and Florida. While this storm is not expected to become a behemoth like Hurricane Maria or Irma, there is a chance this could be a significant system when it reaches Florida this weekend. The future of Dorian largely hinges on one key factor called the Mona Passage. This 80-mile wide ocean corridor, which sits between the islands of Hispañiola and Puerto Rico, will determine if Dorian dissipates or perseveres.