A 'severe' geomagnetic storm is forecast for Earth for the first time in years — here's what to know about these storms

NOAA

• NOAA issued a G4 geomagnetic storm watch for the first time in nearly 20 years.
• This type of storm generates dazzling aurora, but can also cause radio blackouts and outages.
• Experts say we should look out for aurora, but shouldn't worry about major issues. 

For the first time in nearly 20 years, the National Oceanic and Atmospheric Administration has forecasted a "severe" G4 geomagnetic storm to hit this Friday...