1982–83 El Niño
A very strong El Niño caught forecasters off guard, with limited ocean monitoring at the time. It brought severe drought to Australia and flooding to the Americas, and devastated Peru's anchovy fishery.
Worldwide damage ran into the billions, with major losses in farming and fishing.
The surprise spurred build-out of the Pacific buoy network that now underpins El Niño forecasts.
It shows why early advisories like this one matter: the monitoring NOAA now relies on grew out of being blindsided in 1982.
