Was the forecast right for Salt Lake City on Tue Aug 18?
Salt Lake City, Utah · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
14 days out, 4 models put Salt Lake City's Tue Aug 18 high anywhere from 78° to 96°;by the final call, the day before, the field had settled to a median of 92°. The day verified at 94° against the ECMWF IFS analysis, with 0.01 in of precipitation — drizzle.
ECMWF landed closest, off by 0.3°. AIGFS ran 4° cool.
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 Salt Lake City scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-03 | 87° | 85° | — | — | 99° | — | — | 85–99° |
| 14d · 2026-08-04 | 78° | 84° | 96° | — | 89° | — | — | 78–96° |
| 13d · 2026-08-05 | 81° | 73° | 94° | — | 92° | — | — | 73–94° |
| 12d · 2026-08-06 | 85° | 79° | 94° | — | 96° | — | — | 79–96° |
| 11d · 2026-08-07 | 86° | 91° | 93° | — | 93° | — | — | 86–93° |
| 10d · 2026-08-08 | 77° | 85° | 81° | — | 95° | — | — | 77–95° |
| 9d · 2026-08-09 | 84° | 93° | 92° | 92° | 87° | — | — | 84–93° |
| 8d · 2026-08-10 | 87° | 96° | 96° | 91° | 99° | — | — | 87–99° |
| 7d · 2026-08-11 | 83° | 92° | 94° | 92° | 95° | 90° | — | 83–95° |
| 6d · 2026-08-12 | 89° | 85° | 92° | 93° | 94° | 86° | 91° | 85–94° |
| 5d · 2026-08-13 | 90° | 84° | 91° | 92° | 95° | 89° | 90° | 84–95° |
| 4d · 2026-08-14 | 90° | 86° | 93° | 90° | 96° | 91° | 89° | 86–96° |
| 3d · 2026-08-15 | 93° | 87° | 94° | 94° | 95° | 92° | 87° | 87–95° |
| 2d · 2026-08-16 | 92° | 91° | 94° | 95° | 97° | 91° | 91° | 91–97° |
| 1d · 2026-08-17 | 92° | 91° | 94° | 94° | 96° | 91° | 92° | 91–96° |
| actual | 94° |
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 Salt Lake City — 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.