Ingredients for Severe Thunderstorms

What atmospheric conditions are necessary for the formation of severe storms?

• a triggering mechanism to initiate the convection, e.g.,
  • dryline
  • cold front
  • terrain

• Large convective instability (warm air at low levels, cold air aloft)
• lots of low-level moisture
• lots of vertical shear (suggests what needs to be overhead?)

So, what will the sounding look like???? --->>