Phoenix, Arizona Revisions
MILEPOST 1549
Phoenix's forecast for Monday has moved 6°F colder
69°F in the 20261031T00:00Z run, 63°F in the 20261031T06:00Z — 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 17°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Monday, November 2 at 10Z in Phoenix, that trail runs from 69.4°F in the 20261031T00:00Z cycle to 63.0°F in the 20261031T06:00Z — a move of -6.4°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 Monday at 10Z api.weather.city /v1/history (nbm-qmd) |
-6.4 °F | normal 0.0 °F · 3 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
17.2 °F | normal 6.4 °F current run |
- Milepost
- 1549 · laid 2026-10-31T16:25:23Z
- Model
- nbm-qmd · cycle 20261031T06:00Z
- 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
- 18943c34669ee9b50c5f841c9bfc82bb615ab58a2a793a077790f7dbcca66a63
- Machine
- JSON