Discussion
Consider the following pairs of quantity and typical magnitude.
Synoptic relative vorticity - 10 to the minus 5 per second
Coriolis parameter in mid-latitudes - 10 to the minus 4 per second
Tornado vorticity - 10 to the minus 1 per second
Hurricane core vorticity - 10 to the minus 6 per second
How many of the pairs given above are correctly matched?
Answer: A
A hurricane core reaches about \( 10^{-2} \) per second, three orders of magnitude above the synoptic value rather than one order below it, so the last pairing is wrong. The other three are correct. Carrying this ladder of magnitudes in mind makes it immediately obvious which terms of the vorticity equation matter for a given phenomenon.
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