As storms grew to more than 50,000 feet in height, reports of ominous storm clouds and viewer photos arrived from the Foothills. But what exactly causes these scary-looking thunderstorm clouds?

Credit: NASA Earth’s storm clouds typically form near the edges of certain large-scale atmospheric circulation features —the Hadley, Mid-latitude (also called Ferrel), and Polar cells ...

GREEN BAY (WLUK ) -- Another storm has come and gone in Northeast Wisconsin, bringing heavy rain, strong winds, and dark ...

The National Weather Service office in Green Bay has confirmed it was a funnel cloud and said it was possibly a tornado. A funnel cloud was spotted near Manitowoc. (Raychel Fierst via Chime In).