Phoenix, Arizona Revisions
MILEPOST 1556
Phoenix's forecast for Monday has moved 9°F colder
69°F in the 20261031T00:00Z run, 60°F in the 20261101T06:00Z — 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 Monday, November 2 at 11Z in Phoenix, that trail runs from 68.6°F in the 20261031T00:00Z cycle to 59.9°F in the 20261101T06:00Z — a move of -8.7°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 Monday at 11Z api.weather.city /v1/history (nbm-qmd) |
-8.7 °F | normal 0.0 °F · 1 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
14 °F | normal 8.7 °F current run |
- Milepost
- 1556 · laid 2026-11-01T16:25:23Z
- Model
- nbm-qmd · cycle 20261101T06:00Z
- 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
- 58b92cba42c09a9d0fb38ab5c0af714e634596acc33d343a5eddffe8ec05b528
- Machine
- JSON