Nashville, Tennessee Revisions
MILEPOST 1142
Nashville's forecast for Sunday has moved 7°F colder
66°F in the 20260917T12:00Z run, 59°F in the 20260919T06:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 16°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, September 27 at 12Z in Nashville, that trail runs from 66.1°F in the 20260917T12:00Z cycle to 58.8°F in the 20260919T06:00Z — a move of -7.3°F across 8 runs.
The change sits well inside the run's own spread, which is the guidance converging rather than reversing.
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 12Z api.weather.city /v1/history (nbm-qmd) |
-7.3 °F | normal 0.0 °F · 1 of 3 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.1 °F | normal 7.3 °F current run |
- Milepost
- 1142 · laid 2026-09-19T16:25:23Z
- Model
- nbm-qmd · cycle 20260919T06:00Z
- 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
- 6bc2e989110bc2e3973c3c2e796f74a625ae12617b90469aab5df9fefa240cf5
- Machine
- JSON