resolved · Earned
In May 2015 the Bureau's model summary forecast tropical Pacific temperatures to remain above El Niño thresholds through the forecast period.
Source-backed summary; not presented as a verbatim quotation.
Australian Bureau of Meteorology
Climate agency synthesising dynamical model forecasts · Australia
The world at the time.
The tropical Pacific was already in El Niño's early stages and models anticipated additional warming. The forecast focused on persistence and strength rather than the unrelated question of rainfall at every Australian location.
What happened.
The annual climate statement records a very strong El Niño whose Pacific temperature indices peaked in late November. Its continuation through the remainder of 2015 fulfilled the persistence forecast.
Predicted vs actual.
| Metric | Predicted | Actual | Variance / caveat |
|---|---|---|---|
| El Niño persistence through 2015 | Above threshold through forecast period | Very strong event through end of year | Qualitative match |
The counter-signal.
The May model ensemble's October index values ranged from 1.6°C to 2.9°C, indicating material uncertainty in intensity. The preceding 2014 near miss also showed that warming alone could fail to consolidate an event.
Verdict.
Reasoning: sound · Outcome: right
The persistence claim is right and supported by observations plus model agreement. Its success should not be expanded into an accurate forecast of all regional rainfall impacts or an exact index value.
Cause of death / explanatory lens.
No cause of death assigned
The lesson.
Which part of a climate forecast is being scored: event persistence, exact strength, or local impacts?
Sources.
- Climate Model Summary: May 2015primary · 2015 · claim and model spread
- Annual climate statement 2015primary · 2016-01-06 · outcome and 2014 contrast
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