File name: polar-vortex-vertical-structure.png
Original Resolution: 2400 × 2001
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The forecasted structure of the tropospheric jet stream (yellow) and several levels of the stratospheric polar vortex from the lower stratosphere to the upper stratosphere in the NOAA GFS model for 17 January 2025 (initialized on 16 January 2025). The contours show how the stretched polar vortex corresponds to the southward shift of the jet stream over North America. NOAA Climate.gov image, adapted from original by Laura Ciasto.