Tropical storm warnings were issued Saturday for parts of Mexico and Cuba as Ida rapidly gained strength over Caribbean waters, and the storm could start affecting the U.S. Gulf Coast by Tuesday. A hurricane watch was also issued for part of Mexico's Yucatan Peninsula. The warnings were issued for parts of the Yucatan Peninsula and western Cuba. A tropical storm warning was also in effect for Grand Cayman Island. A tentative forecast track from the U.S. National Hurricane Center in Miami shows the storm could hit the U.S. Gulf Coast in the coming days, but forecasters said it was too early to get an accurate picture of what Ida might do. John Cangialosi, a hurricane specialist at the National Hurricane Center, said forecasters should know...