Australian Weather Calendar: October 2017

October photograph by Seenivasan Kumaravel

When Seenivasan Kumaravel looked down from Mount Ainslie on 18 May 2013, Canberra was blanketed in thick, white fog.

Fog forms when water vapour condenses into tiny droplets of liquid water, suspended in the air. It often forms in valleys or other low-lying areas, as air that has been cooled at higher elevations sinks down into the valley. The temperature on the valley floor decreases with the arrival of the cold air, and the water vapour condenses. Fog generally begins to clear after sunrise, as the sun heats the air and evaporates the water droplets.