File name: ENSOBlog_troposphere-vs-stratospheric_polar-vortex_0.png Original Resolution: 2000 × 1452 File Size: 763 KB (MIME Type: image/png) Date Published: December 5, 2023 Download file View image caption The polar vortex is in the polar stratosphere, above the layer of the atmosphere (the troposphere) where most weather, including the jet stream, occurs. NOAA Climate.gov graphic.