Annapolis, Maryland – A rare G4 (Severe) solar storm is expected to affect Earth on Jan. 20, prompting heightened monitoring of Maryland’s 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 large, interconnected electrical networks.
While Maryland sits south of the regions most vulnerable to geomagnetic disturbances, officials note that the state’s dense population, proximity to federal installations, major data centers, and reliance on interstate power transmission increase the importance of grid stability during severe space weather events. NOAA officials emphasize that widespread power outages are not expected, but utilities may take precautionary actions 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, slightly reducing the grid’s margin for error. Grid operators may increase system monitoring, adjust loads, or implement protective measures 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 in the Chesapeake Bay, and precision timing systems used by transportation and emergency services.
As a secondary effect, auroras may be visible farther south than usual, with a low but possible chance of viewing from northern or western Maryland if geomagnetic activity strengthens.
NOAA forecasters say geomagnetic activity could persist at lower levels into Tuesday.
