Atlanta, Georgia Revisions
MILEPOST 1166
Atlanta's forecast for Wednesday has moved 6°F warmer
63°F in the 20260919T06:00Z run, 69°F in the 20260921T00:00Z — the 2nd-largest revision of the 2 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 11°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, September 30 at 12Z in Atlanta, that trail runs from 62.9°F in the 20260919T06:00Z cycle to 69.0°F in the 20260921T00:00Z — a move of +6.1°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 Wednesday at 12Z api.weather.city /v1/history (nbm-qmd) |
6.1 °F | normal 0.0 °F · 2 of 2 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
10.8 °F | normal 6.1 °F current run |
- Milepost
- 1166 · laid 2026-09-21T10:25:18Z
- Model
- nbm-qmd · cycle 20260921T00:00Z
- 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
- 4d50010fd7d1a00078b0bb755fe15bf1972066fd62a1cfff1065b72f19e4bf0d
- Machine
- JSON