Prohibitive rainfall was observed across Northern Australia during December 2025 including departures from normal >400 MM (~16 in.) in northwest Queensland. Conversely, despite La Nina climate, the East Coast was extremely dry. The heavy convection driving the wet climate across Northern Australia caused previously warm SSTA to cool significantly, especially off the East Coast where 30-day changes exceed 4C.

The ECM ENS 15-day temperature anomaly forecast identifies the cold pattern extending across all Western Eurasia. Helping to enhance the cold is gradual snow cover/snow depth increase peaking in 10 days.

The 7-day rainfall observations across South America were aggressively wet in Northern Argentina including Paraguay while East Brazil was extremely dry.

Short-term hazards are intense and feature Blizzard Warnings across the Upper Midwest to the Northern Great Lakes and widespread high wind alerts for the East-central and Midwest U.S. Winter Weather Advisories for snow to ice extend across the Northeast States.