Conditional Instability

  • consider the diagram to the right, notice that at 2 km (or anywhere for that matter):

  • Tup < Te < Tsp

  • The unsaturated parcel will be cooler than then environment and will sink back to the ground

  • The saturated parcel will be warmer than the environment and will continue to ascend

  • This is an example of conditional instability

  • What is the condition???? ANSWER

    The condition for conditional instability is:

  • Gd is the dry adiabatic lapse rate (10C km-1)
  • Ge is the environmental lapse rate (7.8C km-1)
  • Gm is the moist adiabatic lapse rate (6C km-1)