Salt Lake City, Utah Revisions
MILEPOST 1179
Salt Lake City's forecast for Wednesday has moved 7°F colder
76°F in the 20260920T12:00Z run, 69°F in the 20260922T06:00Z — 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 16°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, September 30 at 00Z in Salt Lake City, that trail runs from 76.2°F in the 20260920T12:00Z cycle to 68.9°F in the 20260922T06:00Z — a move of -7.2°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 Wednesday at 00Z api.weather.city /v1/history (nbm-qmd) |
-7.2 °F | normal 0.0 °F · 3 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
16.1 °F | normal 7.2 °F current run |
- Milepost
- 1179 · laid 2026-09-22T17:25:12Z
- Model
- nbm-qmd · cycle 20260922T06:00Z
- 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
- cfb4c7ea4f2dc0af2c29e6c9de6aaa7abede298716577366eb62412f44dee08a
- Machine
- JSON