Record-breaking warmth is spreading across the Western U.S. this weekend, driven by broad upper-level ridging. Afternoon temperatures are expected to soar 15 to 25 degrees above average on both Saturday and Sunday. Numerous locations may challenge or even surpass daily record highs as the warm air mass firmly settles in. Dry conditions are prevalent across most areas, contributing to the unseasonably mild sensation for December, particularly in inland valleys and elevated terrains.