NEW YORK (AP) — A strong solar storm headed to Earth could produce colorful aurora displays across more U.S. states than usual Tuesday night.
The sun earlier this week burped out huge bursts of energy called coronal mass ejections, leading space weather forecasters to issue a geomagnetic storm watch.
Northern lights were forecast in Alaska, Washington, Oregon, Montana, North Dakota, South Dakota, Minnesota, Michigan, Wisconsin, Vermont, New Hampshire and Maine. Parts of northern Idaho, Wyoming, Nebraska, Iowa, Illinois, New York and Pennsylvania may also get a view.
The strength of the light show will depend on how Earth's magnetic field interacts with the solar bursts, said Shawn Dahl at NOAA's Space Weather Prediction Center.
Here’s what to know about auroras and how to spot them.
The sun is at the maximum phase of its 11-year activity cycle, making the light displays more common and widespread. Colorful northern lights have decorated night skies in unexpected places and space weather experts say there are more auroras still to come.
“This is going to kind of continue off and on throughout the year,” Dahl said.
Last spring, the strongest geomagnetic storm in two decades slammed Earth, producing light displays across the Northern Hemisphere. And last fall, a powerful solar storm dazzled skygazers far from the Arctic Circle when dancing lights appeared in unexpected places including Germany, the United Kingdom, New England and New York City.
Aurora displays known as the northern and southern lights are commonly visible near the poles, where charged particles from the sun interact with Earth's atmosphere.
Skygazers are spotting the lights deeper into the United States and Europe because the sun is going through a major facelift. Every 11 years, its poles swap places, causing magnetic twists and tangles along the way.
Severe storms are capable of scrambling radio and GPS communications.
The sun’s active spurt is expected to last at least through the end of this year, though when solar activity will peak won’t be known until months after the fact, according to NASA and the U.S. National Oceanic and Atmospheric Administration.
Solar storms can bring more than colorful lights to Earth.
When fast-moving particles and plasma slam into Earth’s magnetic field, they can temporarily disrupt the power grid. Space weather can also interfere with air traffic control radio and satellites in orbit.
In 1859, a severe solar storm triggered auroras as far south as Hawaii and caught telegraph lines on fire in a rare event. And a 1972 solar storm may have detonated magnetic U.S. sea mines off the coast of Vietnam.
Space weather experts aren’t able to predict a solar storm months in advance. Instead, they alert relevant parties to prepare in the days before a solar outburst hits Earth.
Northern lights forecasts can be found on NOAA’s Space Weather Prediction Center website or an aurora forecasting app.
Consider aurora-watching in a quiet, dark area away from city lights. NASA's Kelly Korreck recommended skygazing from a local or national park. And check the weather forecast because clouds can cover up the spectacle entirely.
Taking a picture with a smartphone camera may also reveal hints of the aurora that aren’t visible to the naked eye.
“Enjoy it,” said Korreck. “It’s this great show ... from the sun to you.”
The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.
FILE - The northern lights appear over Anchorage, Alaska, on Jan. 1, 2025. (AP Photo/Mark Thiessen, File)
RHO, Italy (AP) — No ice is colder and harder than speedskating ice. The precision it takes has meant that Olympic speedskaters have never competed for gold on a temporary indoor rink – until the 2026 Milan Cortina Winter Games.
In the pursuit of maximum glide and minimum friction, Olympic officials brought on ice master Mark Messer, a veteran of six previous Olympic speedskating tracks and the ice technician in charge of the Olympic Oval in Calgary, Canada — one of the fastest tracks in the world with over 300 records.
Messer has been putting that experience to work one thin layer of ice at a time since the end of October at the new Speed Skating Stadium, built inside adjacent trade fair halls in the city of Rho just north of Milan.
“It’s one of the biggest challenges I’ve had in icemaking,’’ Messer said during an interview less than two weeks into the process.
If Goldilocks were a speedskater, hockey ice would be medium hard, for fast puck movement and sharp turns. Figure skating ice would be softer, allowing push off for jumps and so the ice doesn’t shatter on landing. Curling ice is the softest and warmest of all, for controlled sliding.
For speedskating ice to be just right, it must be hard, cold and clean. And very, very smooth.
“The blades are so sharp, that if there is some dirt, the blade will lose the edge,’’ Messer said, and the skater will lose speed.
Speedskater Enrico Fabris, who won two Olympic golds in Turin in 2006, has traded in his skates to be deputy sports manager at the speedskating venue in Rho. For him, perfect ice means the conditions are the same for all skaters — and then if it's fast ice, so much the better.
"It's more of a pleasure to skate on this ice,'' he said.
Messer’s first Olympics were in Calgary in 1988 — the first time speedskating was held indoors. “That gave us some advantages because we didn’t have to worry about the weather, wind blowing or rain,’’ he said. Now he is upping the challenge by becoming the first ice master to build a temporary rink for the Olympics.
Before Messer arrived in Italy, workers spent weeks setting up insulation to level the floor and then a network of pipes and rubber tubes that carry glycol — an antifreeze — that is brought down to minus 7 or minus 8 degrees Celsius (17.6 to 19.4 degrees Fahrenheit) to make the ice.
Water is run through a purification system — but it can’t be too pure, or the ice that forms will be too brittle. Just the right amount of impurities “holds the ice together,’’ Messer said.
The first layers of water are applied slowly, with a spray nozzle; after the ice reaches a few centimeters it is painted white — a full day’s work — and the stripes are added to make lanes.
“The first one takes about 45 minutes. And then as soon as it freezes, we go back and do it again, and again and again. So we do it hundreds of times,’’ Messer said.
As the ice gets thicker, and is more stable, workers apply subsequent layers of water with hoses. Messer attaches his hose to hockey sticks for easier spreading.
What must absolutely be avoided is dirt, dust or frost — all of which can cause friction for the skaters, slowing them down. The goal is that when the skaters push “they can go as far as possible with the least amount of effort,’’ Messer said.
The Zamboni ice resurfacing machine plays a key role in keeping the track clean, cutting off a layer and spraying water to make a new surface.
One challenge is gauging how quickly the water from the resurfacing machine freezes in the temporary rink.
Another is getting the ice to the right thickness so that the Zamboni, weighing in at six tons, doesn’t shift the insulation, rubber tubing or ice itself.
“When you drive that out, if there’s anything moving it will move. We don’t want that,’’ Messer said.
The rink got its first big test on Nov. 29-30 during a Junior World Cup event. In a permanent rink, test events are usually held a year before the Olympics, leaving more time for adjustments. “We have a very small window to learn,’’ Messer acknowledged.
Dutch speedskater Kayo Vos, who won the men’s neo-senior 1,000 meters, said the ice was a little soft — but Messer didn’t seem too concerned.
“We went very modest to start, now we can start to change the temperatures and try to make it faster and still maintain it as a safe ice,’’ he said.
Fine-tuning the air temperature and humidity and ice temperature must be done methodically — taking into account that there will be 6,000 spectators in the venue for each event. The next real test will be on Jan. 31, when the Olympians take to the ice for their first training session.
“Eighty percent of the work is done but the hardest part is the last 20 percent, where we have to try to find the values and the way of running the equipment so all the skaters get the same conditions and all the skaters get the best conditions,’’ Messer said.
AP Winter Olympics: https://apnews.com/hub/milan-cortina-2026-winter-olympics
Serpentines are set on the ice of the stadium where speed skating discipline of the Milan Cortina 2026 Winter Olympics will take place, in Rho, outskirt of Milan, Tuesday, Nov. 11, 2025. (AP Photo/Luca Bruno)
Ice Master Mark Messer poses in the stadium where speed skating discipline of the Milan Cortina 2026 Winter Olympics will take place, in Rho, outskirt of Milan, Tuesday, Nov. 11, 2025. (AP Photo/Luca Bruno)
Workers clean the ice surface during a peed skating Junior World Cup and Olympic test event, in Rho, near Milan, Italy, Saturday, Nov. 29, 2025. (AP Photo/Luca Bruno)
Ice Master Mark Messer poses in the stadium where speed skating discipline of the Milan Cortina 2026 Winter Olympics will take place, in Rho, outskirt of Milan, Tuesday, Nov. 11, 2025. (AP Photo/Luca Bruno)
Ice Master Mark Messer poses in the stadium where speed skating discipline of the Milan Cortina 2026 Winter Olympics will take place, in Rho, outskirt of Milan, Tuesday, Nov. 11, 2025. (AP Photo/Luca Bruno)
