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TheForecast Post

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

Weather Trader Tropics MILEPOST 99

September 14, 2023 Hurricane Season

Invest 97L to become powerful Hurricane Nigel

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.

Hurricane Lee is now west of Bermuda and impacting the island with tropical storm force winds out of the ESE. Maximum sustained winds are 75-knots (Category 1) but the TS wind field is very large, about 700 miles across. To the east, Hurricane Margot continues to slowly loop and pile up ACE points for the season. Margot is no threat to land. Invest 97L is midway between the Leeward Islands and Cape Verde Islands in the central Main Development Region and has a 90% chance of developing into a tropical cyclone — likely major hurricane over the coming days.

NHC track of Lee has held very steady over the past 2-days with completion of extratropical transition before landfall in Nova Scotia. The S inside the white circle means “post-tropical” similar to Sandy prior to landfall in New Jersey in 2012.

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Milepost
99 · laid 2023-09-14T23:07:33.124000Z
Source
https://weather.substack.com/p/september-14-2023-hurricane-season
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