Seasons Change: Tapping into a cool SW'ly flow

A Sou-Westerly flow directs a cool, unsettled air mass over the South East of the Australian continent in the coming-fortnight.

The Recurring Rossby Wave Pattern (RRWP) is one of the key identifiers of hot & cold spells throughout the midlatitudes. The RRWP’s influence on our region remains dynamic as the tussle over tropical heat and polar cold continues. The mid-latitudes are the battleground for this wave pattern.

(Figure 1) Next week’s RRWP outlook highlights the unstable passage of low pressure systems dominating south of The Bight. (Figure 2) 500 hPa height: Weekly mean anomalies Base time: 27 Apr Valid: 1-8 May

ECMWF’s Ensemble 500mb time/longitude hovmoller diagram (below)…