From an isentropic standpoint what is a good indicator of an
     From an isentropic standpoint, what is a good indicator of an active trowal?  Relatively low values (e.g 500 hPa) of lifted condensation pressure coming into the system.  A ridge in the theta e contours in the low to midlevels.  Poorly developed warm conveyor belt.  High condensation difference or the back side of a trough.  
  
  Solution
Ans) Relatively low values of lifted condensation pressure coming into the system

