Atlanta's forecast for Sunday has moved 12°F colder
85°F in the 20260925T00:00Z run, 73°F in the 20260926T18:00Z — the 2nd-largest revision of the 10 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 17°F.
RevisionsSunday, September 27, 2026Atlanta, Georgia
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Milepost 1223
Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, October 4 at 18Z in Atlanta, that trail runs from 85.0°F in the 20260925T00:00Z cycle to 73.3°F in the 20260926T18:00Z — a move of -11.7°F across 8 runs.
The change is about half the run's 10th-to-90th percentile spread, so the earlier forecast is still inside the current range of outcomes.
Model NBM-QMD, via api.weather.city /v1/history. Percentiles are the same run's own.
The numbers in this piece, with what they are measured against
| forecast revision for Sunday at 18Z api.weather.city /v1/history (nbm-qmd) |
-11.7 °F | normal 0.0 °F · 2 of 10 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.7 °F | normal 11.7 °F current run |
- Milepost
- 1223 · laid 2026-09-27T04:25:13Z
- Model
- nbm-qmd · cycle 20260926T18:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Stores
- https://api.weather.city/v1/history
- Tagged
- I-500 Daily Weather · Atlanta, Georgia (33.749, -84.388) · by rule, at build
- Digest
- bdb6cf29b586a7a9812b330e6df488b673972ad74adcd90526437e70784cb683