What question did this study set out to answer?

To analyze the processes influencing the intensification and movement of a cool change along the Victorian coastline.

February 5, 2026

A case of coastal interaction with a cool change

Key Points

To analyze the processes influencing the intensification and movement of a cool change along the Victorian coastline.
Used mesoscale numerical prediction to simulate the cool change event.
Diagnosed the evolution of the front and internal boundary layer effects.
Investigated wind structure changes inland and along the coast.
Simulation effectively captured the cool change dynamics.
Internal boundary layer masked thermal structure at low levels in ocean.
Coastal thermal gradient contributed to the front's surging along the coastline.

Abstract

A surging cool change moved along the Victorian coastline on the afternoon of 21 January 1997. A mesoscale numerical prediction of this event produced an excellent simulation of the evolution of this front, and is used to diagnose processes leading to the intensification and movement of the change. It is shown that the development of an internal boundary layer in hot, dry offshore flow can mask the thermal structure of the change at the lowest levels over the ocean, and can also provide a coastal thermal (density) gradient which, with the reversal of the coastal pressure gradient can lead to the surging of a front along the coast. Differing wind structures before and after the change are seen in the inland and coastal portions of the change, and the implications of these for operational forecasting are discussed.

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