There's a risk for a major severe weather outbreak tomorrow across parts of the Mississippi and Ohio Valleys as shown by the severe weather outlook above, especially in the areas shaded in red, which are under a "moderate risk" for severe weather.
I wrote about this over at The Vane this afternoon, but I'm keeping my promise to post here when major severe weather threatens.
The biggest risk is from tornadoes and very large hail (larger than golf balls) in the supercell thunderstorms that develop across the moderate risk area. The SPC notes that the tornado threat will really ramp up for a couple of hours tomorrow afternoon as low-level shear takes hold.
Later tomorrow afternoon (possibly towards the evening), the supercells will start to merge together and form a squall line that will transition the severe threat over to damaging winds rather than huge hail or tornadoes (though a spin-up tornado isn't out of the question).
If you live in any of these areas, keep an eye on the weather tomorrow. This is the time of the year where you want to keep the Storm Prediction Center open as a new tab permanently.
Due to my class schedule tomorrow, I won't be able to do a liveblog like I usually do in situations like this, but I will try to update my Facebook and Twitter pages as much as possible. Stay safe, everyone.