Snowman67 wrote:12Z GFS shows a 1056HP crossing the border into North Dakota between the 156-162 hr, but then it suddenly scoots east shortly thereafter. Be nice to see it cross in to the U.S. further west in western Montana and have more of an impact on us in the South Plains.
Split flow/El Nino pattern has kept this at bay all winter long to this point across most of the lower CONUS. There have been no strong Arctic Highs more than 1050 mb to drop south into the CONUS all winter. Pattern has just been too progressive for sustained blocking to develop across the lower 48 CONUS. The polar jet has been hung up across the extreme Northern tier of the U.S. and Great Lakes region all season long. The southern stream jet has and continues to be the dominant feature over the CONUS. Now Canada, on the other hand, well that is a different story completely, as bitter cold has been bottled up across there all winter to this juncture, especially Eastern and Central Canada.