Geomagnetic Storm 2024 Damage Map. The most recent g4 (severe) storm occurred on march 23, 2024, while the halloween storms in october 2003 marked the last g5 (extreme) event. Late on october 11, earth’s magnetic field reached g3 (strong) geomagnetic storm levels, then dropped to unsettled levels as the effects of the severe storm began.

A severe magnetic storm commenced on may 10, 2024 at 12:06 eastern time. An explosion of particles arrived at earth on thursday, and could lead to visible northern lights in much of the country while also raising power grid concerns.