This type of sounding is some of the most extreme instability I have seen in Australia. With capes beyond 5000J/kg and Surface Lifted Index of -10C, this is extremely unstable. As expected, the tropopause goes well beyond 200hPa layer! It will be interesting to see despite the low shear what type of activity including extreme lightning what occurs in this region. Temperatures I might add at the 500hPa layer is quite 'cool' for the tropics at near -8C.