The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. It ALWAYS exists near the poles, but weakens in summer and strengthens in winter.

Many times during winter in the northern hemisphere, the polar vortex will expand, sending cold air southward with the jet stream (see accompanying graphic). This occurs fairly regularly during …

Dec 8, 2025 · Winter storms can make driving and walking extremely dangerous. The aftermath of a major winter storm can have a devastating impact for days or even weeks. Winter storms can be …

The "Polar Vortex" simply refers to a large area of low pressure and cold air surrounding both of the Earth’s poles which is always present during the winter. It's not uncommon for parts of this low …

As we transition into the Winter Season, cold fronts should become more frequent and progressively stronger in time. Wildfire spread will become an issue and difficult to dangerous boating and beach …

As we transition into the Winter Season, cold fronts should become more frequent and progressively stronger in time. Wildfire spread will become an issue and difficult to dangerous boating and beach …

The influence on the U.S. is strongest during the winter (December-February), but it may linger into early spring. Not all of the impacts happen during every La Niña episode. Each event is unique and …

A lobe of the polar vortex was dislodged and surged into North America, bringing bitterly cold temperatures to a large portion of the U.S. for several days during the middle of the month of January.

The polar vortex is a regular feature of the atmosphere. Usually it’s the disappearance or disruption of the polar vortex that make cold air outbreaks more likely.

What caused the event? The record cold spell and extended period of wintry weather was caused by the upper level polar vortex dropping south from the north pole and then lingering over south central …