Curtains of red and green peek out from behind a bank of clouds as the aurora borealis illuminates the sky north of Port Angeles on Thursday evening. Otherwise known as the northern lights, the aurora was the result of a severe, G4-category geomagnetic storm in the Earth’s atmosphere triggered by charged particles emanating from the Sun. Auroras were widely visible Thursday across Canada and northern portions of the United States. Forecasts say they might be visible tonight.