NASHVILLE, Tennessee — The overnight severe weather threat has split cleanly into two very different stories as Tuesday morning approaches. North of a defined boundary running from the St. Louis corridor through Cincinnati and into the Mid-Atlantic, the severe weather threat has exited the area and conditions are clearing. South of that line — across Tennessee, Kentucky and northeastern Arkansas — forecasters are continuing to monitor for strong and severe storm development capable of producing wind gusts up to 60 mph, large hail and an isolated tornado through the early morning hours.
The Blue Line — What It Means and Where It Runs
The dividing line on the Tuesday early morning outlook runs on a southwest-to-northeast axis from approximately the Memphis corridor through Nashville, Charleston, West Virginia and toward Washington D.C. Everything north of this line — including Chicago, Indianapolis, St. Louis, Cincinnati, Cleveland, Pittsburgh and Detroit — is now all clear of severe weather as the…..