Boston, Massachusetts – A rare G4 (Severe) geomagnetic storm, in effect for Jan. 20, is expected to reach Earth just ahead of a major Arctic outbreak, prompting heightened monitoring of power and critical infrastructure across New England as temperatures plunge to dangerous levels.
According to the NOAA Space Weather Prediction Center, a coronal mass ejection, or CME, launched from the Sun late last week is forecast to arrive late Sunday into Monday, potentially triggering severe geomagnetic activity. Storms at this level are uncommon and can interfere with power transmission systems, satellites, GPS accuracy, and some radio communications, particularly at higher latitudes.
The geomagnetic storm watch covers Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut, where long-distance transmission lines and northern latitude increase exposure to geomagnetically induced electrical currents. NOAA officials emphasize that widespread power outages are not expected, but the timing is notable as an intense Arctic air mass is forecast to push into the region, with wind chills potentially dropping to –16 degrees or colder in parts of northern New England.
For most residents, the solar storm itself will go unnoticed. However, experts note that geomagnetic activity can reduce the power grid’s margin for error at a time when electricity demand is surging due to extreme cold. Utilities typically increase monitoring during such events and may take precautionary steps to protect sensitive equipment.
Residents are not being asked to take special action beyond standard cold-weather preparedness, such as keeping devices charged and preparing for winter travel. Cell phone service and internet connectivity are expected to remain largely unaffected.
As a side effect, the storm may also produce enhanced aurora displays, with northern lights potentially visible across parts of New England if conditions intensify.
Geomagnetic activity could linger at lower levels into Tuesday, even as the coldest air settles across the northeastern United States.
