Was the forecast right for Charlotte on Tue Aug 18?
Charlotte, North Carolina · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
14 days out, 4 models put Charlotte's Tue Aug 18 high anywhere from 67° to 92°;by the final call, the day before, the field had settled to a median of 93°. The day verified at 93° against the ECMWF IFS analysis, with 0.01 in of precipitation — drizzle.
AIFS landed closest, off by 0.1°. GEM ran 4° warm.
What every model said, at every lead
Daily-high calls for Tue Aug 18 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 Charlotte scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-03 | — | 82° | — | — | 97° | — | — | 82–97° |
| 14d · 2026-08-04 | 92° | 91° | 82° | — | 67° | — | — | 67–92° |
| 13d · 2026-08-05 | 96° | 87° | 96° | — | 95° | — | — | 87–96° |
| 12d · 2026-08-06 | 89° | 95° | 81° | — | 96° | — | — | 81–96° |
| 11d · 2026-08-07 | 92° | 96° | 89° | — | 82° | — | — | 82–96° |
| 10d · 2026-08-08 | 90° | 97° | 96° | — | 88° | — | — | 88–97° |
| 9d · 2026-08-09 | 86° | 94° | 84° | 87° | 93° | — | — | 84–94° |
| 8d · 2026-08-10 | 92° | 89° | 93° | 84° | 93° | — | — | 84–93° |
| 7d · 2026-08-11 | 92° | 92° | 93° | 90° | 90° | — | — | 90–93° |
| 6d · 2026-08-12 | 90° | 92° | 95° | 89° | 99° | 95° | 90° | 89–99° |
| 5d · 2026-08-13 | 90° | 90° | 97° | 82° | 97° | 91° | 92° | 82–97° |
| 4d · 2026-08-14 | 92° | 92° | 95° | 88° | 97° | 94° | 92° | 88–97° |
| 3d · 2026-08-15 | 92° | 93° | 94° | 89° | 102° | 93° | 91° | 89–102° |
| 2d · 2026-08-16 | 92° | 95° | 94° | 91° | 101° | 92° | 93° | 91–101° |
| 1d · 2026-08-17 | 93° | 96° | 93° | 97° | 96° | 92° | 93° | 92–97° |
| actual | 93° |
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 Charlotte — 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.