The stratospheric polar vortex in February was extremely strong, extremely stable, and centered very near the North pole. 50 mb heights and zonal (u-direction) winds were at record levels (low heights in white and westerly winds in red). #NerdAlert #PolarVortex pic.twitter.com/hMMutKenVI

— Brian Brettschneider (@Climatologist49) March 2, 2020