Colin originated as tropical low east of Papua New Guinea and moved southwards and was 220 km east of Fraser Island at its closest point to the Queensland coast.
By far the greatest impact was from the large waves it generated and extensive beach erosion occurred along South Queensland Beaches. The wave recording station at Double Island Pt recorded a significant wave (peak) height of 6.4 m (9.6 m). Further south waves off Sydney Heads were estimated at 12 m in height and several launches were destroyed when 2 m waves penetrated into Botany Bay. A woman was killed at Tathra (South New South Wales) when swept off a cliff top by a large wave.