Discussion
A forecaster computes omega kinematically over an oceanic region and obtains a value of 5 pascals per second.
What is the most likely explanation?
Answer: C
A synoptic omega of 5 pascals per second corresponds to a vertical velocity of about half a metre per second, which is more than an order of magnitude above anything the large scale produces. Accumulated error in the vertically integrated divergence is by far the most likely cause, which is exactly the weakness the O'Brien correction addresses. Deep convection would not be resolved by a synoptic wind analysis in any case. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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