Salt Lake City, Utah Revisions
MILEPOST 1124
Salt Lake City's forecast for Sunday has moved 8°F colder
79°F in the 20260915T18:00Z run, 71°F in the 20260917T12:00Z — the 3rd-largest revision of the 7 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 5°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, September 20 at 21Z in Salt Lake City, that trail runs from 79.4°F in the 20260915T18:00Z cycle to 71.0°F in the 20260917T12:00Z — a move of -8.4°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 Sunday at 21Z api.weather.city /v1/history (nbm-qmd) |
-8.4 °F | normal 0.0 °F · 3 of 7 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
5.3 °F | normal 8.4 °F current run |
- Milepost
- 1124 · laid 2026-09-17T22:25:17Z
- Model
- nbm-qmd · cycle 20260917T12:00Z
- 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
- 7fa8fa054f2e9fad425706261f010fc2cd93b81c61ef8c9e3a23bb5bc1fd9811
- Machine
- JSON