Hur­ri­cane Sal­ly strength­ened to a Cat­e­go­ry 2 ear­ly on Wednes­day and is like­ly to bring “cat­a­stroph­ic and life-threat­en­ing flood­ing” along por­tions of the north­ern Gulf Coast, accord­ing to the Nation­al Hur­ri­cane Cen­ter in Miami.