Phoenix, Arizona Revisions
MILEPOST 1094
Phoenix's forecast for Thursday has moved 14°F colder
99°F in the 20260913T12:00Z run, 85°F in the 20260915T06:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 15°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Thursday, September 17 at 00Z in Phoenix, that trail runs from 98.9°F in the 20260913T12:00Z cycle to 84.9°F in the 20260915T06:00Z — a move of -14.0°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 Thursday at 00Z api.weather.city /v1/history (nbm-qmd) |
-14 °F | normal 0.0 °F · 1 of 5 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
15 °F | normal 14.0 °F current run |
- Milepost
- 1094 · laid 2026-09-15T17:25:47Z
- Model
- nbm-qmd · cycle 20260915T06:00Z
- 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
- 343d03ce2e626bd42fb4bfb32c390f133b62755bd62067e4b5ab3dba2f9acaeb
- Machine
- JSON