Storm surge comparison chart

Storm surge is the difference between the actual observed sea level and the predicted sea level.

The regular rise and fall of the sea level is continuously effected by the weather. Wind stresses on the sea surface and a reduction in atmospheric pressure are the two main causes of storm surge.

Changes in sea level generated by extreme meteorological events, such as winter storms and cyclones, may be positive or negative depending on whether the sea level is higher or lower than predicted.

The effect of storm surge is most severe when these extreme meteorological events occur with high tide.

Onslow (Beadon Creek) and Onslow Salt tide gauges are scheduled to be transferred to the Pilbara Ports Authority in early July. Following the transfer of ownership, the Department of Transport will no longer have access to real-time tide data from these sites and will be unable to display this information on the website. We apologise for any inconvenience this may cause and appreciate your understanding.