Unexpectedly , PERSON@1 strengthened again on December NUMBER@1 and became a hurricane over cooler waters averaging NUMBER@2 NUMBER@3 ° C -LRB- NUMBER@4 NUMBER@5 ° F -RRB- and continuing shear , conditions that are highly unfavorable to maintaining a tropical cyclone .

Unexpectedly , ORGANIZATION@1 strengthened again on December NUMBER@1 and became a hurricane over cooler waters about NUMBER@2 NUMBER@3 ° C -LRB- NUMBER@4 NUMBER@5 ° F -RRB- with continuing wind shear ; which are the conditions that are highly unfavorable for a regular tropical cyclone .
