Text Book Pattern For Eastern US Cold & Snow next 2 weeks! Watch as a Giant Greenland Block intensifies and retrogrades across the Canadian Tundra through the period, forcing cold air deep south and trapping it in the Eastern US. This pattern may even have potential for Southern ❄️ ! We’ll see. For the layman, (relative) warm blocking in the Arctic “displaces” the tropospheric Polar Vortex, forcing cold southward into the US. For the weather nerds out there, the high latitude block reaches 4.5 S