How to calculate the supersized heat waves tracked by the Reuters Climate Monitor.
The code in this repository generated the analysis published in an October 20, 2026 Reuters story headlined "Giant ‘heat storms’ are scorching the Earth. This is the story of the biggest one on record.". The same logic is used by the Reuters Climate Monitor to track heat storms in real time.
The inspiration and methodology are explained in "How (and why) we developed ‘The Age of Heat Storms’".
For the Reuters analysis, temperature readings were drawn from the ERA5 reanalysis dataset published by the European Centre for Medium-Range Weather Forecasts’ Copernicus program. That data is not included here.
Using different temperature readings and baseline climatologies will lead to differing results. Additionally, small differences in computer architecture may affect temperature readings and percentile scores by very small amounts.
The storm names assigned by Reuters are generated using a lottery system with a seeded value so that the results are reproducible. On some computer systems, the seed may not reliably return the same name list. In such a circumstance, you can refer to the table of storms and the names we use in our stories and visualizations, which is included in the repository.
If you have questions about the code or data, you're encouraged to contact Ben Welsh and Maurice Tamman at Reuters.
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