A remarkable transition has taken place in the Nino12 SSTA region off the northwest coast of South America. The daily Nino12 SSTA is -1.94C and the weekly Nino12 SSTA is -1.9C which is the coolest since July 2013.
An intense negative phase of the Antarctic oscillation (-AAO) is forecast for this week. As a result, an unusually intense upper trough is forecast to evolve over Southern Argentina. To the north of that trough, dynamic forcing causes excessive heat to develop in central South America. Centered on Paraguay and far northern Argentina temperatures >100F this week. However, the much cooler air mass to the south roars northward in the 6-10-day period
Areas of heavy rain are in the GFS ENS 15-day outlook for Australia. The northeast coast is wettest with some of that (tropical) rain entrained into a potent upper-level low-pressure area in Central Australia in the 6-10-day period. Another storm may strike the West Coast in the 11-15-day period.
Close monitoring of forecasts across Brazil as we follow the progress of their second corn crop and also the historic dryness already in-place in the U.S. including California, Texas and Montana and the likely intensification ahead as summer 2022 approaches.