Last Wednesday, when cold air rushed into Oklahoma, the National Weather Service in Oklahoma city tweeted a picture of a rare event - lake effect snow in Oklahoma!
Lake effect snow is common around the Great Lakes. It results when cold air moves across warm water. In this case, it was the warm waters from Lake Hefner, which is 15 miles northwest of Oklahoma City) and the cold surface air that moved in from our strong cold front.
According to the NWS in Norman this very rare event resulted in less than half of an inch of accumulation.