The Australian northwest shelf (NWS) is the most cyclone-prone region of Australia and is characterised with large tidal range, wide and steep ocean shelf and extremely complex ocean dynamics. Modelling such a demanding region require 3D baroclinic ocean models, capable of simulating ocean dynamics at wide range of spatial and temporal scales. To that end we used the latest Regional Ocean Modeling System (ROMS) model, specifically tuned to NWS region in order to simulate full 3D ocean response including internal tides as well as effects of recent tropical cyclone (TC) Veronica. Atmosphere forcing during the TC was simulated with high resolution ECMWF IFS atmosphere model at its native 9 km spatial resolution. During that specific event dramatic ocean cooling occurred along the TC path, induced by strong upwelling, mixing and ocean-atmosphere heat exchange. During the TC ocean response in sea level and currents caused significant threat to public (storm surge and flooding) and industry assets at NWS. Comparison with the available observations provide direct confirmation of realistic model results as seen through remote sensed IMOS SST and Chlorophyll data. Such a developed system is capable for fast and timely ocean predictions in near-real time, using Pawsey supercomputer facility. Further improvements using additional 2-way coupled system based on ocean - atmosphere and waves will be further discussed.