A very large risk area today. SPC's take on things is to bring an upper low down into the northern plains and eject eastward across Mississippi. This has the effect of drawing up a lot of moisture from the south (believe me, its here in NE TX already), which provides the energy for storms to fire. Looks like there will also be a mid-level wind max that will whip across the plains eastward, which will provide the wind shear from lower to upper levels. This is the forcing for these storms to rotate, which helps create supercells ripe for tornadic potential.
Tornadoes could form anywhere from NE TX, SE OK into central and S. Arkansas from early afternoon onward, with this risk moving east as time goes on. Looks like were not talking brief EF0 touchdowns, rather some long-lived big outbreaks. Tasty...
http://www.spc.noaa.gov/products/outlook/pwo.html
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