Washington Post: Call it the spring of flash floods. Rare and deadly flash flooding events have struck several parts of the south-central U.S. from Tennessee to Oklahoma this spring, with two remarkable events occurring in just the past five days: the astounding six-to-ten-inch gully washer that resulted in numerous swift-water rescues in Oklahoma City yesterday morning, and the tragic deluge in rural Arkansas late last week. Cars are stranded and submerged by flood water in Oklahoma City after heavy …