For the first time since 2003, an extreme geomagnetic storm — the most severe of its kind — hit Earth on Friday evening. If you missed Friday’s show, more geomagnetic activity is expected to continue on Saturday and Sunday. As of Saturday morning, the National Oceanic and Atmospheric Administration forecast called for another strong geomagnetic storm on Saturday night, although slightly weaker than Friday’s show. And it was only the beginning!”An aurora lit up the sky over Riex, Switzerland early on May 11, after a strong geomagnetic storm. An extreme geomagnetic storm hit Earth on May 10 and caused the northern lights to be visible in parts of the United Kingdom.