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TheForecast Post

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

Weather Trader Tropics MILEPOST 107

September 26, 2023 Hurricane Season

Philippe nearing demise and waiting for Rina

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.

Philippe (17L) is nearing its end with convection well to the east of the center, and is barely holding on as a tropical cyclone. It could degenerate at any time. Invest 91L looks much better with substantial thunderstorm activity at a lower latitude with 80%-90% chance of development in the next few days. I wouldn’t be surprised to see TD 18L and then Tropical Storm Rina in the next 24-48 hours. No other areas of tropical interest in the near term or extended range aside from Rina.

Invest 91L —> Rina will take a track northwesterly out of the deep tropics. There is a better chance according to global and mesoscale models for Rina to reach hurricane status. However, there is a potential for bust again. There is a wide variety of solutions on the eventual track of Rina by Day 10. The track is dependent upon the intensity and steering currents interacting around 20°N latitude in 5-6 days. Unlikely to see Rina threaten land at this point.

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Milepost
107 · laid 2023-09-26T21:24:42.912000Z
Source
https://weather.substack.com/p/september-26-2023-hurricane-season
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