Isobel was a weak category one cyclone north of Western Australia. It originated in the monsoon trough north of the Kimberley coast. The system moved west then southwest across the Timor Sea while north of a deep layered ridge. Good low-level cross-equatorial flow fed into the system and it reached weak category one intensity at 0600 UTC 29 January. The system became embedded in strong upper northwesterly flow which stripped convective cloud off the centre exposing the low-level cloud signature on satellite imagery. By 0000 UTC 1 February it had dissipated 400 km off the Pilbara coast.
For more details see the TC Isobel Report (pdf)
Track and intensity
All times in WST - subtract 8 hours to convert to UTC.