Discussion
Which quantity must be estimated before helicity can be computed?
Answer: B
Helicity is defined relative to the moving storm, so an estimate of the storm motion is required, usually obtained from an empirical rule based on the mean wind and the shear. The Bunkers method is the current standard. Because right moving supercells deviate from the mean wind, using the mean wind instead would substantially underestimate the helicity available to them. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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