A “belt” is just a (contiguous?) region – you have “the Bible belt” or “the sunshine belt” currently. Regions that have a lot of religious people or a lot of sun, respectively.
If you were to draw a map of the places that are predicted to experience a heat index of 125F regularly, it will look like a swathe of the country, like the region of 90s that’s shown on weather maps in the country currently.
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