The early polar vortex split could lead to short-term weather impacts, including colder-than-average conditions in the eastern U.S. and Europe, and warmer-than-average temperatures in the Arctic. However, the full extent of the impacts remains uncertain due to the unprecedented timing of this event. Typically, SSWs weaken the polar jet stream, allowing cold Arctic air to move southward, but the early timing may limit the availability of frigid Arctic air. While the North Atlantic Oscillation has shifted to a negative phase, it is expected to return to neutral by late November, potentially muting the long-term effects of this SSW.