Stratosphere twitter...the GFS shows wave breaking at 1 hPa and a reversal of the zonal mean winds beginning in the upper stratosphere. Wave 2 structure collapses in late Dec. Keeping my eye on the next set of forecasts! (Img cap: Z', U60, T75-90, wave# amps) #SSWcompetition pic.twitter.com/5es1aXKVpI

— Dr. Andrea Lopez Lang (@alopezlang) December 9, 2018