GFS 18z finally activates
Hurricane develops from tropical wave and transits the Atlantic
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.
While the GFS 12z cycle was a ghost town with only minimal development in the tropics, the 18z update lights up a tropical wave in the next 48-hours and goes on to develop Hurricane Emily .
GFS 18z | +48 hours | 850 hPa Relative Vorticity
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- 68 · laid 2023-08-15T23:22:56.999000Z
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