September 4, 2025 Thursday Afternoon Update
Tropical wave now Invest 91L billowing convection and showing signs of development
September 2025 was the 7th-warmest September in the 131-year national record (1895–2025), at 67.9°F against a 1991–2020 normal of 66.0°F (+2.0°F).
September 2025 was the 15th-driest September in the 131-year national record (1895–2025), at 1.9in against a 1991–2020 normal of 2.6in (-0.6in).
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.
Tropical Wave in east central MDR at 80% chance of development, and looks much better than it did yesterday.
Hurricane Kiko remains Category 4 and looks very impressive on satellite after completing an eyewall replacement cycle. It can still make a run at Category 5 well east of Hawaii — but could affect the islands in 6-days.
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- 723 · laid 2025-09-04T16:56:03.244000Z
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