VAUGHAN

History

Tropical Cyclone Vaughan was a short-lived but dramatic Coral Sea system that threatened Far North Queensland in early April 2000. It began as a monsoon low near New Caledonia before drifting north and then northwest into the central Coral Sea, where favourable upper-level outflow and diffluence allowed it to organise quickly. The Brisbane Tropical Cyclone Warning Centre named the system Vaughan on 3 April.

Over the following two days Vaughan strengthened steadily as it tracked west-southwestward on a heading that pointed it at the coast in the vicinity of Cooktown. Early on 6 April it reached severe tropical cyclone status, peaking as a Category 3 system on the Australian scale with an estimated minimum central pressure of about 970 hPa. Maximum sustained (10-minute) winds were of the order of 130–140 km/h, with gusts estimated as high as 170 km/h. Peak intensity occurred roughly 250 km east of Cooktown, still well offshore.

What followed was an unusually abrupt collapse. Between about 8:00 am and 4:00 pm on 6 April, an intrusion of dry mid-level air and otherwise hostile atmospheric conditions stripped the cyclone of its deep convection, and the central pressure rose sharply from 970 hPa to 994 hPa in only around eight hours. Vaughan was downgraded below tropical cyclone intensity while still over open water, and the remnant low crossed the Queensland coastline as a weak system on 7 April.

The rapid weakening spared coastal communities a potentially damaging landfall. While Vaughan was still at peak strength, severe warnings covered the coast from Cooktown south to Townsville, with serious concern over a storm surge exceeding two metres; school closures were prepared and flights into Cairns Airport were cancelled. Once inland, the remnant low delivered localised heavy monsoonal rainfall and minor stream rises across Cape York Peninsula and adjacent coastal catchments. No deaths and no significant structural damage were attributed to the system.

Vaughan was one of the final cyclones of a slightly above-average 1999–2000 Australian region season.

Sources: Bureau of Meteorology report Wikipedia