Huge solar storm: Northern lights possible in California, sunspot visible with glasses

A rare geometric storm watch — the first in nearly 20 years -- starts Friday and lasts all weekend.

CAPE CANAVERAL, Fla. — A strong solar storm headed toward Earth could produce northern lights in the southern United States and potentially disrupt communications this weekend.

The National Oceanic and Atmospheric Administration issued a rare geometric storm watch — the first in nearly 20 years. The watch starts Friday and lasts all weekend.

NOAA said the sun produced strong solar flares beginning Wednesday, resulting in five outbursts of plasma capable of disrupting satellites in orbit and power grids here on Earth. Each eruption — known as a coronal mass ejection — can contain billions of tons of solar plasma.

NOAA is calling this an unusual event, pointing out that the flares seem to be associated with a sunspot that’s 124,000 miles across — 16 times the diameter of Earth.

People who’ve saved their solar eclipse glasses will be able to see that sunspot without magnification, in the sun’s lower right quadrant.

The storm could produce aurora borealis — northern lights — as far south in the U.S. as Alabama and Northern California, according to NOAA.

Its severity is currently categorized as G4, the second strongest. During a call with reporters Friday, Shawn Dahl of NOAA’s Space Weather Prediction Center said that the agency can’t rule out a “low-end” G5 storm.

An extreme geomagnetic storm in 2003 took out power in Sweden and damaged power transformers in South Africa.