The United States is experiencing a dangerous cold snap. In Chicago would be the wind chill today bags to almost fifty degrees Celsius below zero. And that has far-reaching consequences: for example, the Chicago river in the city almost completely frozen over. That is apparent from the above aerial imagery.
Each year it draws the river tens of thousands of observing eyes on St. Patrick’s Day in mid-march. Since the sixties the river that day, a bright green color.