Salt Lake City, Utah Revisions
MILEPOST 1183
Salt Lake City's forecast for Wednesday has moved 9°F colder
76°F in the 20260921T00:00Z run, 67°F in the 20260922T18:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 14°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 20260921T00:00Z cycle to 67.0°F in the 20260922T18:00Z — a move of -9.3°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 Wednesday at 00Z api.weather.city /v1/history (nbm-qmd) |
-9.3 °F | normal 0.0 °F · 1 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14.5 °F | normal 9.3 °F current run |
- Milepost
- 1183 · laid 2026-09-23T04:25:16Z
- Model
- nbm-qmd · cycle 20260922T18:00Z
- 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
- e256898632d8deeaa8c7aa322ce9ffebc50039c55f4eeed1a2781003d0902cf9
- Machine
- JSON