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TheForecast Post

A chronicle of American weather and climate  ·  Wednesday, 16 September 2026

Weather Trader Tropics MILEPOST 100

September 15, 2023 Hurricane Season

TD 15L to become Nigel but avoid land

What the month did

September 2023 was the 9th-warmest September in the 131-year national record (1895–2025), at 67.7°F against a 1991–2020 normal of 66.0°F (+1.8°F).

September 2023 was the 27th-driest September in the 131-year national record (1895–2025), at 2.1in against a 1991–2020 normal of 2.6in (-0.4in).

NOAA/NCEI Climate at a Glance, contiguous United States. This is the observed record for the month, not a score of anything said in this piece — the forecast ledger begins 2026-08-17 and cannot reach earlier posts.

Very brief update this evening — again thank you for subscribing and supporting my work. Update after 6-weeks: 1960 free subscribers and 120 paid subscribers. This is encouraging me to develop products and ideas for winter weather coming up very soon. A distinct weakness of Substack is the inability to automate posts as they do not support API access. Perhaps that will change in the near future — which would allow for personalization and customization of these newsletter updates.

Hurricane Lee is maintaining 70-knots (Category 1) but the convection around the inner-core is long gone. Showers are approaching the Cape Cod peninsula from Lee’s bands but rainfall over Mass/CT/RI looks to be rather scant with a very sharp gradient.

For subscribers

The rest of this piece is for paid subscribers of Weather Trader. The Post keeps the archive, the index and the record; the writing itself stays behind the same subscription it was published under.

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Milepost
100 · laid 2023-09-16T00:01:21.932000Z
Source
https://weather.substack.com/p/september-15-2023-hurricane-season
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