Tropical Cyclone Hubert formed off the northwestern coast of Australia on April 5, 2006. Cyclones form in this area from December through April each year. In April, the start of the Asian Monsoon season gradually shifts storm activity northward to bring the cyclone season to a close. The Australian Bureau of Meteorology had been predicting an average season for cyclones in 2006, with about five named storms of which two might come ashore. With the formation of Hubert, the season became slightly more active than predicted. Unlike Cyclone Glenda, which preceded it by a few days, however, Hubert was not a powerful system and was not predicted to develop much before coming ashore.

This photo-like image was acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite on April 7, 2006, at 10:05 p.m. local time (02:05 UTC). Cyclone Hubert at this time had a basic spiral form, but lacked the well-developed eye and tight-wound shape of a powerful storm, though it has become somewhat more compact and defined than the previous day. Sustained, peak winds in the storm system were roughly 100 kilometers per hour (65 miles per hour) around the time the image was captured. Hubert had remained at this strength for the previous 36 hours, as if the storm was not developing further, despite the changes in the cloud structure and storm-core shape.

Hubert was approaching the same areas of Western Australia affected by Cyclone Glenda a week earlier. At 8 p.m. local time on April 7, the Australian Broadcasting Corporation was reporting that the town of Onslow was close to running out of gas to supply the local power plant. Onslow bore the brunt of Cyclone Glenda the week before, and the gas plant providing the town with electricity was still surrounded by meter-deep flood water from Glenda’s visit. Hubert’s arrival was further hindering efforts to restore and repair services in the town and surrounding communities.