Phoenix, Arizona Revisions
MILEPOST 1372
Phoenix's forecast for Friday has moved 10°F colder
82°F in the 20261011T12:00Z run, 72°F in the 20261013T06:00Z — the 2nd-largest revision of the 9 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 12°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Friday, October 23 at 00Z in Phoenix, that trail runs from 82.2°F in the 20261011T12:00Z cycle to 72.5°F in the 20261013T06:00Z — a move of -9.8°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 Friday at 00Z api.weather.city /v1/history (nbm-qmd) |
-9.8 °F | normal 0.0 °F · 2 of 9 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.3 °F | normal 9.8 °F current run |
- Milepost
- 1372 · laid 2026-10-13T16:25:17Z
- Model
- nbm-qmd · cycle 20261013T06:00Z
- 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
- 72c6a0287fd3070780311b7eeec912716e10eac10e9c8fd870dd1a92ee75b871
- Machine
- JSON