Answer:
A tropical storm at sea has been upgraded to a hurricane.
Step-by-step explanation:
Hurricane warnings are issued with respect to the conditions that may cause the commencement of a hurricane in a particular area. The warning is issued before the winds hit the tropical storm force. This helps in preparing for all the necessary precautionary steps before the storm force effects. The humans are strictly orders to evacuate the area immediately. The local officials warn the public through many means and the announcement through the radio is one of them.