Severe thunderstorms and tornadoes can develop in winter when a strong jet stream disturbance moves across the South, Ohio Valley or ... within 25 miles of a point by late February.

The South saw an initial bout of severe weather Wednesday that produced two reports of tornadoes ... across the already soaked South to the Ohio Valley and central Appalachians on Saturday ...

And that's just from the tornadoes and ... strong systems through the Ohio Valley. The jet stream kept Ohio on the warm side of low fronts, Peloquin said, creating south winds that brought ...