Uploaded March 2021 | Updated September 2026, 2 weeks ago
Screen capture from Earth.Nullschool (earth.nullschool.net/about.html) of 250-millibar temperature (purple is cooler and pink is warmer) and winds (white lines) based on Global Forecast System data from February 15, 2021. A deep dip over the central United States allowed polar air to reach into the Southern Plains. Read about the connection between the polar vortex and wavy jet streams like this in our latest Climate.gov feature, Understanding the Arctic polar vortex (climate.gov/news-features/understanding-climate/understanding-arctic-polar-vortex).
Screen capture from Earth.Nullschool (earth.nullschool.net/about.html) of 250-millibar temperature (purple is cooler and pink is warmer) and winds (white lines) based on Global Forecast System data from February 15, 2021. A deep dip over the central United States allowed polar air to reach into the Southern Plains. Read about the connection between the polar vortex and wavy jet streams like this in our latest Climate.gov feature, Understanding the Arctic polar vortex (climate.gov/news-features/understanding-climate/understanding-arctic-polar-vortex).
