A period of peak magnetic storms on the sun could lead to another show of northern lights on Earth on Saturday and Sunday, forecasters say.

"The aurora does not need to be directly overhead but can be observed from as much as a 1,000 km [621 miles] away when the aurora is bright and if conditions are right," the agency explains on its website.

Another round of northern lights will be viewable from several locations across the United States, likely to produce a magical display of colors swirling through the night sky on Tuesday ...