The progression of lower tropospheric temperature departures from normal when beginning with the 1-5 day period, cycling through the 6-10d period, and ending w/the 11-15d period. This is a forecast from the ECMWF EPS, which highlights a big shift in the pattern for the US ❄️🎄 pic.twitter.com/jFrFekXKcY

— Mike Ventrice (@MJVentrice) December 1, 2017