Nashville, Tennessee Revisions
MILEPOST 1152
Nashville's forecast for Saturday has moved 6°F colder
84°F in the 20260918T06:00Z run, 78°F in the 20260920T00:00Z — the 2nd-largest revision of the 4 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 Saturday, September 26 at 18Z in Nashville, that trail runs from 84.2°F in the 20260918T06:00Z cycle to 77.8°F in the 20260920T00:00Z — a move of -6.5°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 Saturday at 18Z api.weather.city /v1/history (nbm-qmd) |
-6.5 °F | normal 0.0 °F · 2 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
11.7 °F | normal 6.5 °F current run |
- Milepost
- 1152 · laid 2026-09-20T10:25:16Z
- Model
- nbm-qmd · cycle 20260920T00:00Z
- 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
- 23f675413a3dda2240c357128aaf193bfacb5678ef14bb17a87337da0f2a8320
- Machine
- JSON