Used to collect data to predict an el niño

Answer

Weather buoys

Explanation

NOAA or National Oceanic and Atmospheric Administration is an American  scientific agency within the United States Department of Commerce that focuses on the conditions of the oceans, major waterways, and the atmosphere. NOAA uses Weather buoys   to collect data to predict an El Niño.  EL Nino  is the cycle of warm and cold temperatures, as measured by sea surface temperature and it is accompanied by high air pressure in the western Pacific and low air pressure in the eastern Pacific.

Weather buoys are instruments which collect weather and ocean data within the world's oceans, as well as aid during emergency response to chemical spills, legal proceedings, and engineering design

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