This anomalous 500mb geopotential height pattern is also talking with the stratosphere. It's not even October yet and we're seeing the Stratospheric Polar Vortex elongated in attempt of a split. Don't think there will be a split this early on but I wonder if this is foreshadowing pic.twitter.com/7cfiYhvQDl

— Mike Ventrice (@MJVentrice) September 23, 2018