A powerful storm system will bring several life-threatening weather hazards to Tennessee starting Wednesday night, including the threat of flash flooding and tornados, warns the National Weather Service.

A powerful storm system will bring several life-threatening weather hazards to Tennessee starting Wednesday night, including the threat of flash flooding and tornados, warns the National Weather Service.

The potent storm system will bring the threat of “significant, life-threatening flash flooding” starting Wednesday, according to the Weather Prediction Center.

As thunderstorms threatened to hit parts of the Midwest and South, forecasters warned of flash flooding and tornadoes.

Several Illinois counties are under a tornado watch as a storm moves northward through the state. The following counties are under a tornado watch as of 3:35 p.m.: Champaign, Christian, Clark, Clay, Coles,

On this page, you'll find maps below that will help you track the tornado outbreak and potentially catastrophic flooding as the event unfolds. Check back throughout the coming days, as these maps will update frequently with the latest information.

A once-in-a-generation extreme weather event is expected to begin Wednesday, starting with a tornado outbreak and continuing into the weekend with the possibility of flooding in epic proportions -- with all the severe weather devastating the same corridor.

The entire region remains in a level 3 out of 5 risk for severe weather and tornadoes Wednesday night into Thursday morning.

The U.S. National Weather Service has issued a coastal flood advisory for Southwest Louisiana and a flood watch for Northeast Louisiana.

The WXII 12 First Warning Weather team is monitoring the chance for a few rain showers and isolated storms Wednesday evening along a warm front in the Piedmont Triad of North Carolina. The warm front moving into Winston-Salem and Greensboro is part of a weather system that will impact our neighbors to the west tonight with a threat of nocturnal tornadoes.

Supercell thunderstorms could produce multiple long-lived EF3 or stronger tornadoes today in the mid-Mississippi and lower Ohio valleys. Tornadoes, destructive straight-line winds and damaging hail will also impact a much larger area of the Midwest and South.

A highway of moisture flowing off unusually warm waters — combined with an intense storm system — will result in dangerous flooding from Arkansas through the Ohio and the Tennessee valleys over the next few days.