On July 30, 2024, NIWA reported that the anomalies from the recent stratospheric warming have started to propagate downward and are affecting tropospheric weather patterns in the southern hemisphere.
The Southern Annular Mode (SAM) has started shifting into its negative phase this week, likely caused by a recent sudden stratospheric warming (SSW) event over Antarctica, which is expected to bring colder and wetter conditions to southern Australia.
A rare Sudden Stratospheric Warming (SSW) event has been detected in the stratosphere above the Antarctic region over the past week. Forecast models predict it will start to filter down through the atmosphere later this month.
Current forecasts indicate a strong Stratospheric Warming event in January 2024, potentially leading to a weakened Polar Vortex and a significant weather pattern shift across the United States and Europe.
As the winter season of 2023/2024 approaches, meteorologists are closely monitoring a developing Polar Vortex in the stratosphere over the North Pole. Early indications suggest that its rapid intensification may influence weather patterns across parts of North America and Europe.
The polar vortex, a large area of low pressure in the upper atmosphere that typically sits over the poles, is set to weaken as a sudden stratospheric warming (SSW) event unfolds in the northern hemisphere. This event has the potential to have a significant impact on winter weather, as it allows cold Arctic air to escape and cause outbreaks in Europe, Asia, Canada, and the United States.
After the Sudden Stratospheric Warming (SSW) event at the beginning of January 2021 and the Polar Vortex collapse, weather patterns across the northern hemisphere became very dynamic and progressive. This has set the stage for a potentially quite significant cold…
A Sudden Stratospheric Warming event started over the weekend in association with a significant weakening or reversal of westerly winds circulating around the North Pole — between 10 and 50 km (6 – 31 miles) above the ground — the stratospheric polar vortex. …
A major Sudden Stratospheric Warming (SSW) event is predicted to occur as we start the new year. If the models are correct, we can expect prolonged extremely cold temperatures to affect parts of the northern hemisphere by mid-January. SSW refers to a rapid rise in…
Forecast models suggest a major stratospheric warming event might develop in December 2019, possibly initiating a collapse sequence of the polar vortex. Main cooling effects are expected across Eurasia and the United States. "This might have important…
