An amplified high-pressure ridge has emerged in Brazil triggering an expansive heatwave in which much of the nation is exposed to >100F risk. The super-hot weather is likely to last for a while as the high-pressure ridge holds into October. Dry weather is focused on central and northern Brazil during the hot weather pattern.

A semi-permanent summertime high-pressure ridge in the vicinity of the New Zealand marine heatwave much of the past 10 years is likely to regenerate during summer 2023-24. Proposed is an added climate diagnostic supporting an anomalous dry and hot summer 2023-24 climate pattern across Australia causing a major drought.

The latest 15-day upper air forecast for the southern hemisphere (by GFS) reveals an amplifying titanic upper-level high pressure ridge developing southwest of South America. Previously, the 2020-23 semi-permanent Amundsen Sea upper trough was “locked-in” the previous 30+ days and responsible in part for a wet pattern for much of Chile, Argentina, and Brazil. The pattern is about to reverse.

During the past 30 days a wet climate has emerged across Brazil, Chile, and eastward across Central Argentina. The wet pattern was somewhat unexpected. The rainy pattern has shifted soil moisture wetter in Central/East-central, and Southeast Brazil and eroded Chile and Argentina drought.