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Story summary
- Southern California faces an unseasonable winter heat wave this week, with temperatures 20–30 degrees above normal.
- The National Weather Service forecasts highs of 98°F in Coachella Valley and 99°F in coastal valleys on Thursday and Friday.
- A heat advisory is in effect, warning that 16.8 million residents may face heat-related illnesses and should stay hydrated.
- Temperatures may dip this weekend and rise again next week, potentially reaching 100°F.
