Great example of our @WxCoEnergy Clusters in 12-hourly resolution in which models are having a very difficult time in predicting the timing and placement of an arctic cold front for Christmas Eve. GEFS Clusters on Top, ECMWF EPS middle, and GEM Ensembles on bottom. pic.twitter.com/tfle2aVWnq

— Mike Ventrice (@MJVentrice) December 13, 2017