Australian Weather Calendar: October 2018

October photograph by Seenivasan Kumaravel

Seenivasan Kumaravel loves a forecast of 'Partly sunny with rain later', because it means the clouds will be unpredictable. He drove up to the Capital Wind Farm near Canberra on just such a day–23 October 2014–to see the turbines.

Wind is air moving from areas of higher pressure to areas of lower pressure. The rotation of the earth makes winds in the southern hemisphere spiral clockwise around low pressure systems, and anti-clockwise around high pressure systems. The greater the pressure difference, the stronger the wind that will blow across an area. This is indicated by the density of isobars (lines of constant pressure) on an air pressure chart. Where isobars are bunched together, such as around a cold front, stronger winds will blow.