Was the forecast right for Charlotte on Mon Aug 17?
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 Mon Aug 17 high anywhere from 74° to 95°;by the final call, the day before, the field had settled to a median of 98°. The day verified at 97° against the ECMWF IFS analysis, with 0.01 in of precipitation — drizzle.
AIFS landed closest, off by 0.2°. GEM ran 5° warm.
What every model said, at every lead
Daily-high calls for Mon Aug 17 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 · 2026-08-02 | — | 92° | — | — | 74° | — | — | 74–92° |
| 14d · 2026-08-03 | 74° | 82° | 86° | — | 95° | — | — | 74–95° |
| 13d · 2026-08-04 | 87° | 85° | 77° | — | 68° | — | — | 68–87° |
| 12d · 2026-08-05 | 96° | 85° | 93° | — | 102° | — | — | 85–102° |
| 11d · 2026-08-06 | 95° | 82° | 82° | — | 97° | — | — | 82–97° |
| 10d · 2026-08-07 | 95° | 97° | 94° | — | 95° | — | — | 94–97° |
| 9d · 2026-08-08 | 95° | 97° | 97° | 87° | 85° | — | — | 85–97° |
| 8d · 2026-08-09 | 91° | 98° | 93° | 88° | 102° | — | — | 88–102° |
| 7d · 2026-08-10 | 95° | 96° | 102° | 92° | 103° | — | — | 92–103° |
| 6d · 2026-08-11 | 96° | 97° | 99° | 93° | 104° | 102° | 97° | 93–104° |
| 5d · 2026-08-12 | 97° | 98° | 101° | 95° | 101° | 100° | 96° | 95–101° |
| 4d · 2026-08-13 | 97° | 98° | 103° | 92° | 104° | 97° | 97° | 92–104° |
| 3d · 2026-08-14 | 97° | 98° | 102° | 95° | 103° | 96° | 97° | 95–103° |
| 2d · 2026-08-15 | 97° | 98° | 98° | 96° | 104° | 95° | 98° | 95–104° |
| 1d · 2026-08-16 | 97° | 99° | 98° | 102° | 100° | 98° | 98° | 97–102° |
| actual | 97° |
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.