Discussion
Which area on a hodograph gives storm relative helicity?
Answer: A
Storm relative helicity over a layer equals twice the area swept out between the storm motion vector and the hodograph over that layer. Values above about 150 square metres per square second in the lowest three kilometres indicate an environment favourable for rotating updraughts. The dependence on the storm motion is why the quantity must be recomputed for each candidate storm. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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