Gravity wave clouds form in wave-like patterns in sky, oftentimes resembling ripples in a body of water from a rock being thrown. These types of clouds ... influence the weather even in regions ...

Kevin Skarupa recently spoke to the third-graders at Barka Elementary School in Derry.

In this installment of Weather Impact 101, we discuss the various types of wintry precipitation, how they form and which is the most dangerous.