Highlight: Steadily, -AO/-NAO causes a colder national pattern. Chart of the day: Titanic blocking ridge pattern first half of December. Discussion: Both the North Atlantic oscillation (NAO) and arctic oscillation (AO) dip to -3.0 to -3.5 later next week which is represented by the 500 MB anomaly ridge pattern over Greenland throughout the first half of December. Gradually, the U.S. turns cold in this pattern. Week-2 Ahead Forecast valid December 12-18, 2022: Cold sprawl. Discussion: -AO/-NAO steadily cause a cold pattern to sprawl across the U.S. as mid-December approaches. Generally, dry weather accompanies the East cold while the prevailing storm track brings more snow to the West. Week-3 Ahead Forecast valid December 19-25, 2022: Cold pattern persists. Discussion: Cold pattern hangs on as -AO/-NAO persist Christmas Week. Snow bias is in the West. All states are colder than normal except the Southwest U.S. Week-4 Ahead Forecast valid December 26, 2022-January 1, 2023: Cold pattern eases. Discussion: The last week of December indicates moderation and south of snow cover temperatures could easily be warmer than shown. Most of the anomalous precipitation remains over the Northern Rockies and Louisiana.