Nashville, Tennessee Revisions
MILEPOST 1132
Nashville's forecast for Sunday has moved 10°F colder
69°F in the 20260916T18:00Z run, 59°F in the 20260918T12:00Z — 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 68.9°F in the 20260916T18:00Z cycle to 59.3°F in the 20260918T12:00Z — a move of -9.6°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 Sunday at 12Z api.weather.city /v1/history (nbm-qmd) |
-9.6 °F | normal 0.0 °F · 1 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
15.8 °F | normal 9.6 °F current run |
- Milepost
- 1132 · laid 2026-09-18T22:25:15Z
- Model
- nbm-qmd · cycle 20260918T12:00Z
- 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
- f043e16db051f8f98e46b8f435ae77b96efea55ce0da5b4f536a977572c3c156
- Machine
- JSON