Nashville, Tennessee Revisions
MILEPOST 1201
Nashville's forecast for Tuesday has moved 9°F colder
89°F in the 20260922T18:00Z run, 81°F in the 20260924T12:00Z — the 3rd-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 8°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, September 29 at 18Z in Nashville, that trail runs from 89.3°F in the 20260922T18:00Z cycle to 80.6°F in the 20260924T12:00Z — a move of -8.7°F across 8 runs.
The change is larger than the run's own 10th-to-90th percentile spread — the guidance did not merely narrow, it moved off its previous position.
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 Tuesday at 18Z api.weather.city /v1/history (nbm-qmd) |
-8.7 °F | normal 0.0 °F · 3 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
8 °F | normal 8.7 °F current run |
- Milepost
- 1201 · laid 2026-09-24T22:25:15Z
- Model
- nbm-qmd · cycle 20260924T12:00Z
- 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
- b7b15f603550e8caabe0274b9fd77673246b3bab27f564c4bee366ef0db40a77
- Machine
- JSON