U.S. Medium-range Forecast

 Medium-range 6-10 Day Forecast Valid February 18-22, 2018 Medium-range 11-15 Day Forecast Valid February 23-27, 2018 Days 6-10/11-15 commentary: In the 6-10 day period the GFS and ECM ensembles are averaged to produce the forecast result which remains the tale of 2 (cold and warm) regimes. In the 11-15 day period the pattern remains unchanged…