Nashville's forecast for Tuesday has moved 10°F colder
64°F in the 20260927T00:00Z run, 54°F in the 20260928T18:00Z — 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 18°F.
RevisionsTuesday, September 29, 2026Nashville, Tennessee
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Milepost 1240
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, October 6 at 12Z in Nashville, that trail runs from 64.5°F in the 20260927T00:00Z cycle to 54.5°F in the 20260928T18:00Z — a move of -10.0°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 Tuesday at 12Z api.weather.city /v1/history (nbm-qmd) |
-10 °F | normal 0.0 °F · 2 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
17.8 °F | normal 10.0 °F current run |
- Milepost
- 1240 · laid 2026-09-29T04:25:14Z
- Model
- nbm-qmd · cycle 20260928T18:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Stores
- https://api.weather.city/v1/history
- Tagged
- I-500 Daily Weather · Nashville, Tennessee (36.163, -86.781) · by rule, at build
- Digest
- 157fd216518a9dab77d9196737daa646a466c374a1b383ce1f1cd01d44e1046f