Nashville, Tennessee Revisions
MILEPOST 1141
Nashville's forecast for Wednesday has moved 7°F colder
86°F in the 20260917T06:00Z run, 79°F in the 20260919T00:00Z — the 3rd-largest revision of the 5 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 12°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, September 23 at 18Z in Nashville, that trail runs from 86.1°F in the 20260917T06:00Z cycle to 79.4°F in the 20260919T00:00Z — a move of -6.7°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 18Z api.weather.city /v1/history (nbm-qmd) |
-6.7 °F | normal 0.0 °F · 3 of 5 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.4 °F | normal 6.7 °F current run |
- Milepost
- 1141 · laid 2026-09-19T11:25:16Z
- Model
- nbm-qmd · cycle 20260919T00:00Z
- 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
- 747c50b3ae2e9b3cab4d927be5d493d4b72fb313e51748bc8cf5e252f0d2278e
- Machine
- JSON