 Late on 20 May , the JTWC ceased advisories on the system as it weakened below tropical depression status offshore . However , the Bureau of Meteorology continued to monitor the system . Early on 21 May , the center of Herbie made landfall in Shark Bay with wind gusts up to 120 km / h ( 75 mph ) and a pressure of 980 hPa ( mbar ) . Due to the rapid movement of the storm , it reached the Great Australian Bight while retaining tropical characteristics despite its low @-@ latitude . Early on 22 May , the system lost its identity south of Australia as an extratropical cyclone . 
