Nashville's forecast for Tuesday has moved 11°F colder
72°F in the 20260924T18:00Z run, 61°F in the 20260925T12:00Z — the 3rd-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 24°F.
RevisionsFriday, September 25, 2026Nashville, Tennessee
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Milepost 1213
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, October 6 at 06Z in Nashville, that trail runs from 72.0°F in the 20260924T18:00Z cycle to 61.4°F in the 20260925T12:00Z — a move of -10.6°F across 8 runs.
The change sits well inside the run's own spread, which is the guidance converging rather than reversing.
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 06Z api.weather.city /v1/history (nbm-qmd) |
-10.6 °F | normal 0.0 °F · 3 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
24 °F | normal 10.6 °F current run |
- Milepost
- 1213 · laid 2026-09-25T22:25:14Z
- Model
- nbm-qmd · cycle 20260925T12:00Z
- 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
- dcfadf6291aacc1f805fc643be9db3039fbce0161541422db9abc76e2ff0d3ee