However , as Bavi approached the islands , upper level wind shear caused the system to decouple and start to gradually weaken .
United Airlines , Cape Air and United Express all cancelled flights that departed from Guam , while schools were shut on the island during March 15 .
As Bavi approached the islands , upper level wind shear caused the system to decouple and start to gradually weaken .
United Airlines , Cape Air and United Express all cancelled flights that departed from Guam , while schools were shut on the island during March 15 .