NOAA Issues G2 Geomagnetic Storm Watch for October 16
The NOAA's Space Weather Prediction Center has issued a G2 (Moderate) geomagnetic storm watch for October 16, 2025, due to multiple coronal mass ejections from the Sun, potentially making auroras visible in 15 U.S. states.
The National Oceanic and Atmospheric Administration's (NOAA) Space Weather Prediction Center has issued a G2 (Moderate) geomagnetic storm watch for October 16, 2025. This follows multiple coronal mass ejections (CMEs) from the Sun between October 11 and 13, which are expected to reach Earth late Thursday night into Friday morning.
Geomagnetic storms occur when solar material interacts with Earth's magnetic field, potentially causing auroras to be visible farther south than usual. NOAA's aurora forecast indicates that residents in 15 states—Alaska, Washington, Idaho, Montana, North Dakota, South Dakota, Minnesota, Wisconsin, Michigan, New York, Maine, New Hampshire, Vermont, Wyoming, and Iowa—may have the opportunity to observe the northern lights.
To enhance viewing chances, individuals are advised to select locations with minimal light pollution, clear northern horizons, and cloudless skies. The optimal viewing period is between midnight and 2 a.m. local time, when the sky is darkest.
The CMEs originate from sunspot region AR4246, a large and complex grouping of sunspots that has been active in producing M-class solar flares. One such flare on October 13 is associated with the current CMEs heading toward Earth. While geomagnetic storms can disrupt power grids, satellites, and radio communications, the anticipated G2 storm is expected to have manageable impacts. However, the combined arrival of multiple CMEs could intensify the storm's strength and duration.
Given the complexities of solar activity, the exact strength of the storm remains uncertain. Nonetheless, for those in the northern U.S., tonight presents a promising opportunity to witness the aurora borealis.