Nashville, Tennessee Revisions
MILEPOST 1131
Nashville's forecast for Wednesday has moved 9°F colder
88°F in the 20260916T12:00Z run, 79°F in the 20260918T06:00Z — the 2nd-largest revision of the 6 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 15°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 88.5°F in the 20260916T12:00Z cycle to 79.5°F in the 20260918T06:00Z — a move of -9.0°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) |
-9 °F | normal 0.0 °F · 2 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.7 °F | normal 9.0 °F current run |
- Milepost
- 1131 · laid 2026-09-18T16:25:18Z
- Model
- nbm-qmd · cycle 20260918T06:00Z
- 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
- 645ae8ec23cde1ce2a497d2a95092c243e1ab03778fb7692c092660bef901fa9
- Machine
- JSON