The northern lights could illuminate skies overnight on Aug. 18-19, thanks to a fast-moving stream of solar wind that may spark geomagnetic storm conditions, potentially triggering visible auroras across 15 states, according to the National Oceanic and Atmospheric Administration (NOAA).

Forecasters from NOAA's Space Weather Prediction Center (SWPC) and the U.K. Met Office predict a chance of minor (G1) geomagnetic storm conditions tonight, with further possible aurora enhancements in the days to come.

You can keep up with the latest forecasts and geomagnetic storm warnings with our aurora forecast live blog.

What's causing the aurora activity?

A large coronal hole is currently facing Earth, ejecting a fast-moving stream of solar wind in our general direction. Coronal holes are open reg

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