Geomagnetic Storm May Bring Northern Lights to 15 U.S. States Tonight
A G2 (moderate) geomagnetic storm is expected to impact Earth tonight, potentially making the northern lights visible in 15 U.S. states.
The National Oceanic and Atmospheric Administration (NOAA) has issued a G2 (moderate) geomagnetic storm watch for October 16, 2025, due to the anticipated arrival of coronal mass ejections (CMEs) that departed the Sun between October 11 and 13. This geomagnetic activity may cause the northern lights to be visible in 15 U.S. states, including Alaska, Washington, Idaho, Montana, North Dakota, South Dakota, Minnesota, Wisconsin, Michigan, New York, Maine, New Hampshire, Vermont, Wyoming, and Iowa.
The strongest impact is expected late Thursday night into early Friday morning, with geomagnetic storming predicted to peak between 5 p.m. and 11 p.m. EDT. The Kp index, a measure of geomagnetic activity, is estimated to reach 5.67, aligning with G2 storm levels. Auroras are highly unpredictable; even within the view line, clear skies, minimal light pollution, and a clear view northward are essential for optimal viewing.
To increase the chances of observing the northern lights, NOAA recommends heading to a dark location far from city lights, finding a north-facing view with a clear horizon, and looking up around midnight to 2 a.m. local time. Patience is key, as auroras often come in waves and can appear faint at first. Utilizing space weather apps that provide aurora forecasts based on location can also be beneficial.
The current auroral activity is attributed to the arrival of CMEs that left the Sun over the course of October 11-13. These CMEs are expected to interact with Earth's magnetosphere, leading to the observed geomagnetic storming and potential auroral displays.