Colorado River Reservoir Levels Today
Compare the latest water-surface elevations, storage volumes, and approximate seven-day changes at Lakes Powell, Mead, Mohave, and Havasu.
Earth
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El Niño and La Niña: What They Are and How Forecasts Work
A clear guide to El Niño, La Niña, ENSO monitoring, forecast probabilities, global impacts, and the limits of seasonal prediction.
Arctic and Antarctic Sea Ice Today
Daily Arctic and Antarctic sea-ice extent from the NSIDC Sea Ice Index, with recent changes, charts, methodology, and limitations.
Earthquakes Today
Live USGS data for earthquakes recorded in the rolling past 24 hours, with magnitudes, depths, locations, and guidance on how to read the numbers.