Was the forecast right for Atlanta on Sun Aug 9?
Atlanta, Georgia · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
14 days out, 4 models put Atlanta's Sun Aug 9 high anywhere from 84° to 90°;by the final call, the day before, the field had settled to a median of 90°. The day verified at 91° against the ECMWF IFS analysis, with 0.05 in of precipitation — drizzle.
AIGFS landed closest, off by 0.0°. GFS ran 4° cool.
What every model said, at every lead
Daily-high calls for Sun Aug 9 as each model's runs approached it — the last archived run per day. NBM and The Spread's own blend are consensus products and stay out of these ranges and rankings; the Atlanta scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 14d · 2026-07-26 | 90° | 84° | 86° | — | 90° | — | — | 84–90° |
| 13d · 2026-07-27 | 92° | 95° | 95° | — | 93° | — | — | 92–95° |
| 12d · 2026-07-28 | 87° | 90° | 86° | — | 99° | — | — | 86–99° |
| 11d · 2026-07-29 | 86° | 90° | 91° | — | 97° | — | — | 86–97° |
| 10d · 2026-07-30 | 85° | 86° | 96° | — | 97° | — | — | 85–97° |
| 9d · 2026-07-31 | 83° | 86° | 94° | 84° | 95° | — | — | 83–95° |
| 8d · 2026-08-01 | 84° | 84° | 85° | 77° | 93° | — | — | 77–93° |
| 7d · 2026-08-02 | 88° | 85° | 87° | 84° | 95° | — | — | 84–95° |
| 6d · 2026-08-03 | 86° | 87° | 88° | 85° | 97° | 92° | 96° | 85–97° |
| 5d · 2026-08-04 | 87° | 84° | 89° | 89° | 93° | 91° | 96° | 84–96° |
| 4d · 2026-08-05 | 88° | 89° | 90° | 87° | 93° | 93° | 93° | 87–93° |
| 3d · 2026-08-06 | 88° | 89° | 86° | 87° | 94° | 92° | 93° | 86–94° |
| 2d · 2026-08-07 | 88° | 90° | 90° | 90° | 93° | 91° | 90° | 88–93° |
| 1d · 2026-08-08 | 89° | 91° | 90° | 87° | 86° | 90° | 91° | 86–91° |
| actual | 91° |
Read it honestly
This is one date, not a league table. A model can win a day it deserved to lose; rankings only mean something over a window. For that, see which model has been most accurate in Atlanta — or every city The Spread scores.
Forecasts are what each model's archived runs said at the time, captured at The Spread's sweep times — never reconstructed after the fact. Truth is the ECMWF IFS analysis (temperature_2m_max). The actual values are the ones in hand when this receipt was settled, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; receipts exist only for dates the archive watched arrive.