I notice that when you check SRH at the SPC mesoanalysis site the graphic now also shows something called "effective inflow base" that's measured in meters above ground level. What exactly is this parameter measuring, and how is it calculated? I tried a search but I couldn't really find much information about this particular index. There is some reference to "Effective Inflow Layer" here (PDF), which I assume means the same thing as Effective Inflow Base... But I was wondering if someone could tell me in less technical terms what the significance of the EIB parameter is, and how it's meant to be used. Thanx.