Models are indicating the setup of a potential rex block along the eastern seaboard with the passage of fridays storm. The GFS is allowing this to move out fairly quickly which i suspect is too fast if this type of block does indeed set up. These blocks are never forecasted well by the modelling so any modelling suggesting a warm pattern to end off the month is probably wrong. The european weeklies support this type of pattern which would drive the cold air across the yukon, northern B.C and alaska SE under the strong block to the north. If this occurs with the snowpack building behinds fridays system the cold air will stay in place for a while and the storminess will shift further east favouring apps runners, and east coast snowstorms.