Boston, Massachusetts – A rare G4 (Severe) solar storm is expected to affect Earth on Jan. 20, prompting heightened monitoring of Massachusetts’ power grid and critical technology systems as federal space weather officials track incoming solar activity.
According to the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center, a coronal mass ejection (CME) launched from the Sun late last week is forecast to arrive late Sunday into Monday. G4-level geomagnetic storms are uncommon and can interfere with power transmission systems, satellite operations, GPS accuracy, and some radio communications, particularly across densely interconnected regions.
While Massachusetts is farther south than the most geomagnetically exposed states, officials note that the state’s high population density, reliance on interstate power transmission, and concentration of critical services increase the importance of grid stability during severe space weather events. NOAA emphasizes that widespread power outages are not expected, but utilities may take precautionary measures to protect sensitive equipment.
For most residents, the solar storm itself will not be noticeable. Experts explain that geomagnetic activity can introduce electrical currents into long transmission lines, reducing the grid’s margin for error. Grid operators may increase monitoring, adjust system loads, or take protective actions if conditions intensify.
Cell phone service and internet connectivity are expected to remain largely unaffected. However, minor GPS inaccuracies are possible, particularly affecting aviation operations, marine navigation, and precision timing systems used by industry and emergency services.
As a visible side effect, auroras may become visible across parts of Massachusetts, especially in western or northern areas, if geomagnetic activity strengthens beyond current forecasts.
NOAA forecasters say geomagnetic activity could continue at lower levels into Tuesday.
