Record winter warmth around the globe has raised pressure on weather forecasters from utilities and financial markets that depend on models to work out the economic impact of climate change.

Abnormally high temperatures led to billions of dollars of lost revenue for energy producers, which have curtailed fuel supplies because everyone from homeowners to heavy industry didn’t need as much heat as usual. Europe was particularly affected with temperatures 3.4°C above normal. Those extreme variations are sharpening the focus on the systems meteorologists use to predict seasonal patterns weeks or even months in the future...

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