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TheForecast Post

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

Weather Trader Tropics MILEPOST 78

Tropical Depression forming near Yucatan

Invest 93L organizing over warm waters of southern Gulf of Mexico

What the month did

August 2023 was the 10th-warmest August in the 132-year national record (1895–2026), at 74.4°F against a 1991–2020 normal of 73.1°F (+1.3°F).

August 2023 was the 43rd-wettest August in the 132-year national record (1895–2026), at 2.8in against a 1991–2020 normal of 2.7in (+0.1in).

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.

NHC has raised the development chances to “high” or 70% in next 2-days and 90% in next 7-days. Based upon satellite imagery, a tropical depression may form before the end of Saturday. A burst of convection has consolidated west of the tip of Cuba. Not sure where a low-level center may exist, if it does in fact. The next name is Idalia .

Invest 93L will spend 2-3 days over the very warm water of the eastern Gulf of Mexico. However, models are rather conservative with intensity suggesting a strong tropical storm or minimal hurricane at landfall on Wednesday or early Thursday, probably along the Florida panhandle. The tracks are clustered on Apalachicola for 00z models, but that envelope could shift east/west based upon the eventually location of the center of circulation. Previous experience has shown an underestimation in forecast intensity from models. We should not be surprised if a stronger hurricane H1 or low H2 arises over 90°F ocean water.

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Milepost
78 · laid 2023-08-26T12:26:10.355000Z
Source
https://weather.substack.com/p/tropical-depression-forming-near
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