A G4 geomagnetic storm is considered "severe" and may have the following effects, as listed by the NOAA Space Weather Scales: Power systems: Possible widespread voltage control problems and some ...

Geomagnetic storms reaching G4 strength have been known to bring the northern lights into southern parts of the U.S., but that might not be the case this time.

The geomagnetic storm is expected to be a G4 class, according to the scale used by the U.S. National Oceanic and Atmospheric Administration (NOAA)'s Space Weather Prediction Center (SWPC).

If you've never heard of a solar storm or geomagnetic storm, chances are you'll learn about those really quickly this weekend. Earth is under a severe G4 watch or geomagnetic storm watch for the ...

While geomagnetic storms reaching G4 strength have been known to bring the northern lights to much of the country — at times as far south as Alabama and northern California — it’s unlikely ...

In March, a geomagnetic storm briefly reached G4 strength for a few hours. Advertisement. That event was the third geomagnetic storm to reach G4 status during the current 11-year solar cycle, ...

WEEK. IT’S A WARM ONE OUT THERE, A GEOMAGNETIC STORM WATCH HAS BEEN ISSUED FOR THE FIRST TIME SINCE JANUARY OF 2005. THIS MEANS A SEVERE GEOMAGNETIC STORM IS STILL LIKELY THROUGH THE WEEKEND ...

A severe G4 geomagnetic storm could emerge on Friday, triggering a watch for a storm of this magnitude from NOAA officials for the first time in nearly 20 years. The watch comes after days of ...

The "severe" G4 geomagnetic storm sparked auroras across the U.S. on Thursday night, with less powerful but still significant solar storms expected to continue throughout Friday.

A "severe" G4 geomagnetic storm could make auroras visible across the country Thursday, according to forecasters with National Oceanic and Atmospheric Administration.Here's what we know about the ...