Nashville, Tennessee Revisions
MILEPOST 1129
Nashville's forecast for Wednesday has moved 10°F colder
89°F in the 20260916T06:00Z run, 79°F in the 20260918T00:00Z — the 2nd-largest revision of the 8 cities on the roster that moved at all. 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 Wednesday, September 23 at 18Z in Nashville, that trail runs from 89.1°F in the 20260916T06:00Z cycle to 78.8°F in the 20260918T00:00Z — a move of -10.3°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) |
-10.3 °F | normal 0.0 °F · 2 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.4 °F | normal 10.3 °F current run |
- Milepost
- 1129 · laid 2026-09-18T10:25:20Z
- Model
- nbm-qmd · cycle 20260918T00:00Z
- 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
- b874a12bdfcb115cac3a082b237cb816480bec6f9ba1e45a9b5f702238bee9f6
- Machine
- JSON