On January 20, 2026, a rare G4 geomagnetic storm triggered by a coronal mass ejection (CME) from the sun on Jan. 18 is expected to reach Earth, according to the NOAA Space Weather Prediction Center. While the event may temporarily disrupt GPS and radio communications, especially in precision agriculture, its timing during the off-season minimizes immediate impact. Still, past storm damage underscores the vulnerability of U.S. ag systems to space weather during peak crop activity.

The NOAA Space Weather Prediction Center (SWPC) has issued a Severe G4 Geomagnetic Storm Watch for January 20, 2026, as a coronal mass ejection (CME) from the sun-tied to an X1.9 solar flare-is expected to interact with Earth's atmosphere. Though these storms can compromise GPS navigation, communications, and radio-based technologies, the off-season timing limits risk for most U.S. ag operations.

The SWPC cautions that "detrimental impacts to critical infrastructure" are possible, including temporary signal loss in satellite navigation systems. For farmers and agribusinesses increasingly dependent on precision agriculture, GPS-guided tractors, sprayers, and harvesters, even short outages can affect data logging and spatial accuracy.

One upside to the solar event? Auroras may become visible as far south as Alabama and northern California, a rare spectacle for mid-latitudes.

However, January's quiet activity window in the farm calendar means low immediate threat. "This isn't planting or harvest season, so we're not expecting the kind of economic blow we saw in 2024," one meteorological analyst noted.

That 2024 reference points to the "Gannon Storm" of May 10, 2024, when a similar CME struck during spring planting. According to Kansas State University, GPS outages during that storm caused an estimated $565 million in losses for Midwestern crop producers.

Solar flares and CMEs are driven by powerful magnetic field reconnections near sunspots. Like earthquakes, they're measured in energy classes: B, C, M, and X, with X flares the most intense. The current flare, X1.9, sits at the lower end of the X-scale, but still potent enough to trigger a severe geomagnetic event.

Storms peak during solar maximum, a cyclical period of heightened solar activity. NASA and NOAA confirm that Solar Cycle 25 entered maximum phase around 2024, expected to persist into mid-2025. Thus, farmers may see more frequent GPS disruptions, especially during spring and fall when accurate field data is critical.

Today's farms rely heavily on digital records and real-time positioning, from as-applied fertilizer maps to yield monitoring and input traceability. Without GPS, those records can't be georeferenced, limiting agronomic analysis and downstream planning by seed dealers and consultants.

Newer systems with multi-constellation GPS receivers offer better resistance to solar interference. Older equipment, especially single-frequency receivers, is more susceptible.

Farmers can take proactive steps, including:

• Review GPS equipment specs: Dual-frequency receivers offer better solar resilience.

• Back up local data: Maintain short-term storage to avoid total loss during cloud outages.

• Pause operations if needed: When storms hit during work hours, stopping fieldwork can prevent inaccurate logging.

For now, the Jan. 20 storm is not expected to cause long-term ag disruptions, but it's a reminder of the need for robust tech protocols as the U.S. farm sector navigates a more digitized-and solar-sensitive-era.