It's not over when the snow stops How potholes form when the snow melts.
Roofs can collapse under the weight of snow.
Ice jam flooding is a danger when snow and ice begin thawing. The science of winter weather When where, and how much cold air moves into the USA depends in large part on the position and strength of the polar vortex. Lake effect snow brings the Great Lakes region some of the USA's heaviest snow. Northeasters are the big storms that can dump snow on the East Coast states. Alberta Clippers form over Alberta, Canada and race southeastward across the USA with snow, often light, and often drag cold air south.