Tropical Cyclone Olga

5 - 9 April 1981


Early in April there was a persistent low with associated convective activity northwest of Cocos Island. This low slowly moved southwest and deepened, attaining cyclone intensity on 7 April. The storm continued deepening and reached peak intensity three days later when a clear eye could be seen on satellite imagery. At that time the central pressure was estimated at 940 hPa with maximum winds of about 180 km/h.

During 10 and 11 April, Olga moved steadily south-southwest. This movement was probably influenced by a very intense low that was operating in the Amsterdam-Kerguelen Island area near longitude 80°E.

The influence of this low continued as it moved eastwards. On the 13th Olga accelerated to the east-southeast as it came under the influence of strong northwesterly winds ahead of the southern depression. Most of the cloud sheared from the storm's centre and it had become extra-tropical by 14 April. The system finally dissipated on the 18th after moving erratically off the Western Australian coast.

The highest reported wind was north-northwest at 70 km/h at 1800 UTC on the 12th by a ship 220 km northeast of the centre. The closest land station to the cyclone was Cocos Island which recorded easterly winds up to 56 km/h during 7 April, and a pressure of 1004 hPa when Olga was located about 620 km northwest of the island. No damage or loss of life was reported.

Track and intensity

Best Track of Tropical Cyclone Olga