Hot air that has been building for weeks in WA's north has been advecting slowly southwest over the past two days. Parts of the Kimberley have been hotter than average for three weeks, with Fitzroy Crossing reaching 40° on all except two days since 15 October. That warm air arrived in the state's Central and Lower West and Wheat Belt today, bringing daytime temperatures commonly 8 to 12 above average. Perth reached 36.5 at the Airport, 11 above normal and only 1.7 below the record for this early in the season.