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Which layer is used for the standard thickness chart?

  • A.500 to 250 hectopascals
  • B.1000 to 850 hectopascals, which represents the depth of the boundary layer over most lowland areas
  • C.1000 to 500 hectopascals
  • D.850 to 700 hectopascals, which spans the layer in which most low level cloud is usually found

Answer: C

The 1000 to 500 hectopascal thickness spans roughly the lower half of the atmosphere by mass and is the traditional field for identifying air masses and forecasting precipitation type. Its typical mid-latitude value is around 540 to 570 decametres. The other layers are used for more specialised purposes, such as identifying warm noses aloft or examining the upper level thermal structure near the jet.

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