From Climate Central (Brian Kahn):
A winter heat wave is spreading inland from the West Coast and could bring unseasonable warmth spanning from coast-to-coast by the weekend.
Southern California is on track to continue setting hot temperature records, Phoenix will have its earliest first 90°F day of the year, and parts of the South could see temperatures 20°-30°F above normal.
While the heat is unusual in its magnitude, warmer winters in the U.S. are becoming the rule, not the exception. It’s the fastest-warming season for 37 states that roughly 220 million people call home.