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Which parcel suits an assessment of elevated nocturnal convection?

  • A.A parcel taken from the level at which the dew point depression reaches its smallest value in the sounding
  • B.The most unstable parcel within the lowest few hundred hectopascals
  • C.The surface parcel, which is the natural starting point for any assessment of convective potential at all
  • D.The mixed layer parcel

Answer: B

Where a stable nocturnal layer separates the surface from the convecting layer, the relevant parcel is the one with the greatest equivalent potential temperature aloft. Elevated thunderstorms over a shallow cold pool are the classic case. Choosing a surface parcel there would show a stable atmosphere when in fact vigorous convection is possible from above the inversion. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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