"It's quite unheard of." A storm in the Gympie region could have also been caused by a microburst, similar to what Brisbane experienced, the BOM said. A microburst is a "downburst" on a smaller scale.

A microburst is a "downburst" on a smaller scale. A downburst is a concentrated downdraft — typically lasting five to 15 minutes — of unusually high speed. According to the BOM, there are two ...

Another theory is that a weather phenomenon called a downburst, which sees high winds and huge precipitation suddenly drop from a thunderstorm, could also have buffeted the Bayesian.