Data sources
El Niño status
NOAA Climate Prediction Center (CPC): weekly Niño 3.4 index, ONI index and ENSO Alert System status. Refreshed every 6 hours on our server.
Ocean temperature
NOAA Coral Reef Watch: daily sea surface temperature anomaly (difference from normal). Refreshed every 12 hours.
Heat, rain and wind
Open-Meteo, which combines forecast models from national weather services. Refreshed every 1 to 3 hours.
Typical El Niño effects
NOAA CPC map of typical El Niño impacts (December to February season), redrawn approximately. It shows tendencies, not exact forecasts.
Map boundaries
IBGE (Brazilian states and mesoregions) and Natural Earth (world countries and states). Relief: Mapzen Terrain Tiles (AWS Open Data). 3D globe: three.js.