What is the polar vortex?
The polar vortex is a large-scale cyclone of cold air that typically circulates around the Arctic.
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Weather / Global Weather
Polar Vortex Disruption Forecast: Cold Air Outbreaks Across North America and Europe
A significant disruption of the polar vortex is underway, poised to unleash the coldest air of the season across North America and bring a substantial cold wave to Europe. This event, forecast to extend into early February, stems from a shi...
Key Insights
- The polar vortex, a large-scale cyclone of cold air, typically remains over the Arctic but can be disrupted by stratospheric warming events.
- A stratospheric warming event is destabilizing the polar vortex, leading to a core split and the southward movement of cold air.
- Forecasts indicate a strong cold-air anomaly spanning from southern Canada into the central and eastern United States, with potential record lows in the Midwest and Northeast.
- Europe is also expected to experience colder air coverage, with potential for significant snowfall across the continent.
- The jet stream plays a crucial role in steering Arctic air southward, and a buckle in the jet stream is expected to bring repeated shots of cold air to the Great Lakes region.
- Regional stratospheric warming expands westward from Russia causing a colder pattern in Europe which could reach East U.S. late month.
In-Depth Analysis
The polar vortex is a persistent, large-scale cyclone that circles the Arctic and contains extremely cold air. Disruptions to the vortex occur in the stratosphere and can be triggered by stratospheric warming events. These events weaken the polar vortex or even reverse its usual west-to-east winds. When this couples with the jet stream below, the jet stream can become more wavy, allowing Arctic air to shift southward.
This disruption is characterized by a stretching and displacement of the polar vortex core, with a strong high-pressure anomaly over northern Canada. This pattern supports a northerly flow at the surface levels over the eastern U.S., leading to a cold air outbreak extending as far south as Florida.
In late January, a more substantial stratospheric warming event is anticipated, further disrupting the polar vortex and opening the Arctic floodgates. This will result in a significant cold air outbreak across southeastern Canada and the United States, with potential temperatures reaching -35°F in Canada and below -20°F in the upper Midwest. Europe is also expected to experience increased cold air coverage, particularly in the northern and eastern regions.
Snowfall is expected to accompany the cold air, with significant potential for lake-effect snow around the Great Lakes and widespread snowfall across the Midwest and Northeast. Europe is also likely to see substantial snowfall, extending into southern regions.
**How to Prepare:**
- Stay informed about local weather forecasts and warnings.
- Prepare your home and car for extreme cold, including having emergency supplies on hand.
- Take precautions to prevent frostbite and hypothermia, such as dressing in layers and limiting time outdoors.
- Be aware of potential travel disruptions due to snow and ice.
**Who This Affects Most:**
- Residents of the Midwest, Northeast, and southeastern Canada are most at risk of experiencing extreme cold temperatures.
- Individuals who are elderly, have underlying health conditions, or lack access to adequate heating are particularly vulnerable.
- Travelers and commuters may face disruptions due to snow and ice.
FAQ
What causes a polar vortex disruption?
Disruptions are caused by stratospheric warming events, which weaken the polar vortex and allow cold air to spill southward.
How will this polar vortex disruption affect North America?
Expect extreme cold temperatures, heavy snowfall, and potential travel disruptions, particularly in the Midwest and Northeast.
How will this polar vortex disruption affect Europe?
Expect colder air coverage, particularly in northern and eastern regions, with potential for significant snowfall.
Takeaways
- A major polar vortex disruption is forecast to bring extreme cold and heavy snowfall to North America and Europe.
- The disruption is caused by stratospheric warming events that weaken the polar vortex.
- Prepare for potential travel disruptions, take precautions to prevent frostbite and hypothermia, and stay informed about local weather forecasts.
- The coldest temperatures are expected in the Midwest, Northeast, and southeastern Canada.
- Europe will also experience increased cold air coverage and snowfall.
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Disclaimer
This article was compiled by Yanuki using publicly available data and trending information. The content may summarize or reference third-party sources that have not been independently verified. While we aim to provide timely and accurate insights, the information presented may be incomplete or outdated.
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