John,
You might be right. I will say however that very large hail does occur in Bangladesh and that this sounding is quite typical of those associated with severe weather in Bangladesh (although the 300 mbar temperature is a little on the warm side). I don't think you will find soundings from Bangladesh with the -10 to -30 layer much lower than this (outside of winter anyway). Regarding the shear...well we can't really expect a sounding taken in the morning, at once specific location, to represent the conditions in the afternoon, particularly along boundaries, such as a warm front or an outflow boundary, where storms are likely to fire.
Edit: I think that I should be careful not to speculate too much. I have access to very little meteorological data from the area so I am relying only on GFS model output and a single sounding.
