A car is abandoned on a flooded street following heavy rains and flash flooding in Bay Shore, N.Y., on Wednesday. The South Shore of Long Island along with the tri-state region saw record-setting rain that caused roads to flood. Andrew Theodorakis/Getty Images hide caption

itoggle caption Andrew Theodorakis/Getty Images

The jet stream that circles Earth's north pole travels west to east. But when the jet stream interacts with a Rossby wave, as shown here, the winds can wander far north and south, bringing frigid air to normally mild southern states. NASA/GSFC hide caption

itoggle caption NASA/GSFC

They're down there somewhere: The Great Lakes as seen from space on Wednesday. Lake Ontario, which has less ice than the others, is at the lower right. A bit of open water can be seen in Lake Superior, at the upper left. CoastWatch.glerl.noaa.gov hide caption

itoggle caption CoastWatch.glerl.noaa.gov

Last week in Indianapolis, the Kehoe children — from left, Maria, Anthony and Veronica — played with shaving cream as their mother Joanne tried to keep them occupied when the weather outside was awful. R. Brent Smith/AP hide caption

itoggle caption R. Brent Smith/AP

Not a good day for a drive: A Georgia Department of Transportation sign warned motorists in Norcross Wednesday morning, and few were on the roads. John Amis/AP hide caption

itoggle caption John Amis/AP