Imelda and Humberto deliver double threat, with dangerous surf and flooding for USTropical Storm Imelda is forecast to strengthen into a hurricane as Hurricane Humberto churns as a Category 4 hurricane in the Atlantic. Tropical Storm Imelda is forecast to strengthen into a hurricane as Hurricane Humberto churns as a Category 4 hurricane in the Atlantic. Tropical Storm Imelda is forecast to strengthen into a hurricane as Hurricane Humberto churns as a Category 4 hurricane in the Atlantic. Tropical Storm Imelda is forecast to strengthen into a hurricane as Hurricane Humberto churns as a Category 4 hurricane in the Atlantic. On the heels of Humberto, Imelda could track even closer to Bermuda, with potential for a direct landfall Wednesday into Thursday.