Harvard study casts doubt on jet stream theory linked to rising heat waves and floods

Theory Briefing

• Harvard researchers found insufficient statistical evidence to support the theory that Arctic warming is slowing the jet stream and causing simultaneous extreme weather events.
• The 'wavy jet stream' theory became widely cited in media and policy circles, illustrating how attractive narratives can outpace peer-reviewed validation.
• The study challenges the scientific community to separate robust climate findings from premature consensus, a textbook case of theory overreach in high-stakes research.