Atlanta, Georgia Revisions
MILEPOST 1138
Atlanta's forecast for Monday has moved 9°F colder
72°F in the 20260917T00:00Z run, 63°F in the 20260918T18:00Z — the 2nd-largest revision of the 6 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 14°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Monday, September 28 at 06Z in Atlanta, that trail runs from 72.0°F in the 20260917T00:00Z cycle to 63.4°F in the 20260918T18:00Z — a move of -8.6°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 06Z api.weather.city /v1/history (nbm-qmd) |
-8.6 °F | normal 0.0 °F · 2 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.2 °F | normal 8.6 °F current run |
- Milepost
- 1138 · laid 2026-09-19T10:25:16Z
- Model
- nbm-qmd · cycle 20260918T18:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Source
- https://api.weather.city/v1/history
- Digest
- 448dcc7937822ddafe90dc9c90164e66ea821374e5525de9891bbe01f26810a5
- Machine
- JSON