Multiple systems are pushing across the Northern Tier of the country this week, bringing heavy snow to the Great Lakes, Ohio Valley and Northeast.

Waves slammed into beaches along Argentina’s northern coast, including Santa Clara del Mar, Mar Chiquita Partido and Mar de Cobo. The freak waves, known as a meteotsunami, killed a 29-year-old man and injured 35 others, officials said. Meteotsunamis are generated by meteorological conditions. Air-pressure disturbances, the kind linked to fast-moving weather events like severe thunderstorms and squalls, drive meteotsunamis. The storm generates a wave that pushes toward the shore. The wave can become dangerous as it reaches shallow water because it slows down and increases in height and intensity.

A series of cold fronts will bring frigid arctic air into the U.S. this week into the weekend. Gusty winds will result in wind chills below zero across the Midwest and Great Lakes. The cold air will sink as far south as the Gulf Coast with lows in the 20s and 30s across Florida by the end of the week and into the weekend. Watch this video to see when the coldest air will impact you.

Fresh snow and warmer temperatures have elevated the risk of avalanches in the western part of the country. Over the weekend, slides killed three snowmobilers in Wyoming and Washington State.

As Storm Goretti dumped heavy snow on England, something else in the sky captivated residents and millions of people around the world as the video spread online. The sky was awash in a mysterious pink glow. Was it the northern lights or some other celestial phenomenon? Turns out the answer was much closer to home.