The National Oceanic and Atmospheric Administration (NOAA) is forecasting a minor G1-class geomagnetic storm for May 12, 2025. A G1 storm is the lowest level on the geomagnetic storm scale.
Understanding Geomagnetic Storms
Geomagnetic storms are disturbances in Earth's magnetosphere caused by solar activity, such as solar flares and coronal mass ejections (CMEs). These events send charged particles toward Earth, interacting with our planet's magnetic field. The Kp-index, ranging from 0 to 9, measures the magnitude of these disturbances. A Kp-index of 5 or greater indicates a geomagnetic storm.
Potential Effects of a G1 Storm
A G1 geomagnetic storm can cause weak fluctuations in power grids and minor impacts on satellite operations. Migratory animals may also be affected. One of the more visually appealing effects is the potential for auroras at high latitudes, such as northern Michigan and Maine.
Staying Informed
While G1 storms are generally minor, it's still helpful to stay informed about space weather forecasts. Online forecasts and international meteorological labs provide ongoing monitoring of solar activity.
The greatest expected 3 hr Kp for May 10-May 12 2025 is 4.33 (below NOAA Scale levels).
The Met Office is forecasting very isolated M or X-class flares possible from active region in the northwest.