 On March 4 , an approaching trough turned the cyclone to the south and southeast , producing stronger wind shear that induced weakening . By that time , the JTWC estimated Heather had weakened to a 1 ‑ minute intensity of 150 km / h ( 90 mph ) . The cyclone reintensified slightly while accelerating to the southeast , and MFR estimated Heather re @-@ attained its peak of 165 km / h ( 105 mph ) on March 5 . Soon after , the storm began weakening again , and on March 7 Heather exited into the Australian region below tropical cyclone status . The cyclone continued to the southeast , becoming extratropical on March 8 and dissipating the next day in the Great Australian Bight . 
