Colorful auroras could be visible in areas of the United States such as Alabama and Northern California — much farther south than they typically appear — on Thursday evening due to a powerful solar flare and coronal mass ejection released from the sun, according to the National Weather Service’s Space Weather Prediction Center.
The severe solar storm, classified as a level 4 on a scale from 1 to 5, also could disrupt communications, the power grid, and satellite operations, according to officials at the center.
The storm is expected to reach Earth between early morning and 12 p.m. ET Thursday, with the potential to last through Friday.
The intensity and full characteristics of the storm, moving toward Earth at more than 2.5 million miles per hour (about 4 million kilometers per hour), won’t be known until it reaches the Deep Space Climate Observatory and the Advanced Composition Explorer satellites orbiting 1 million miles from Earth.
The satellites will measure the speed and magnetic intensity of the storm, which is expected to arrive at Earth 15 to 30 minutes after reaching the space observatories, said Shawn Dahl, service coordinator for the Space Weather Prediction Center, at a news briefing Wednesday.
A series of the most intense type of solar flares, known as X-class flares, have released from the sun this week. The flares also coincided with coronal mass ejections on Tuesday.
Coronal mass ejections are large clouds of ionized gas called plasma and magnetic fields that erupt from the sun’s outer atmosphere. When these outbursts are directed at Earth, they can cause geomagnetic storms, or major disturbances of Earth’s magnetic field.
“Geomagnetic storms can impact infrastructure in near-Earth orbit and on Earth’s surface,” according to the Space Weather Prediction Center.
As a result, the center has notified the Federal Emergency Management Agency, the North American power grid, and satellite operators to prepare for disruptions, especially given the preparations and expected relief efforts for Hurricane Milton, Dahl said.
Historically, G4 storms are common during a solar cycle, but G5, or extreme geomagnetic storms such as the one that occurred on May 10, are incredibly rare, Dahl said. This new storm has a 25% chance of becoming a G5, he said.
As the sun nears solar maximum — the peak in its 11-year cycle, expected this year — it becomes more active, and researchers have observed increasingly intense solar flares erupting from the fiery orb.
Currently, scientists at the prediction center believe visible auroras are likely to appear in central Eastern states and the lower Midwest, but it remains to be seen whether the storm will cause a global phenomenon of auroras as the G5 in May did, Dahl said. However, if the storm escalates to a G5, auroras could be visible across southern states and elsewhere around the world.
National Oceanic and Atmospheric Administration officials recommend using the center’s aurora dashboard to find out whether northern and southern lights are predicted to be visible in your area. The dashboard is constantly updated and can show where an aurora may appear within minutes of the information becoming available.
The chance of seeing auroras has dramatically increased, given that darkness falls earlier during this time of year. Sky-gazers in the US who spied auroras caused by a G3 storm over the weekend witnessed the northern lights within an hour or two after nightfall, Dahl said.
Even if the colorful displays don’t seem apparent to the naked eye, sensors in cameras and cell phone cameras can pick them up, center officials said.
NOAA scientists said they don’t believe this week’s storm will surpass the one in May. Before then, the last G5 storm to hit Earth was in 2003, resulting in power outages in Sweden and damaging power transformers in South Africa.
During the May geomagnetic storm, tractor company John Deere reported that some customers reliant on GPS for precision farming experienced a disruption. However, power grid and satellite operators managed the buildup of intense geomagnetic currents on the grid systems effectively.
The solar storm in May was the most successfully mitigated space weather storm in history, Dahl said.
Scientists are continuing to monitor the spikes in solar activity as they increase because they could indicate where the sun currently is in its cycle.
The speed of Tuesday’s coronal mass ejection surprised scientists at the center because it’s the fastest measured in this solar cycle so far, Dahl said. However, that doesn’t mean the peak of solar activity is occurring right now. Previous solar cycles have shown that some of the biggest storms can happen after the peak, he said.
“We are in the midst of solar maximum right now; we just don’t know if we reached the peak yet,” Dahl said. “That would be decided later and could be either sometime this year or even early next year. Bottom line is, we’re still in for a ride with the solar cycle activity through this year, as well as next year and even into early 2026.”