Atlanta's forecast for Monday has moved 11°F colder
81°F in the 20260925T18:00Z run, 71°F in the 20260927T18:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 16°F.
RevisionsMonday, September 28, 2026Atlanta, Georgia
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Milepost 1230
Successive cycles do not merely refresh a forecast; they leave a trail. For Monday, October 5 at 18Z in Atlanta, that trail runs from 81.2°F in the 20260925T18:00Z cycle to 70.6°F in the 20260927T18:00Z — a move of -10.6°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 Monday at 18Z api.weather.city /v1/history (nbm-qmd) |
-10.6 °F | normal 0.0 °F · 1 of 7 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.4 °F | normal 10.6 °F current run |
- Milepost
- 1230 · laid 2026-09-28T04:25:13Z
- Model
- nbm-qmd · cycle 20260927T18:00Z
- 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
- 47762b5218537c6fe17b7f13583d3f9d85ee9e849bf8e10bd0e7efc6a1aa0553