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Hi Bart- > This is a question more for Don than for Jeff I think. And it is more about a > product than an IDV technique ... although maybe it is something within IDV. > > In the 12 km NAM product from NCEP, there is a derived 2D variable (also > listed as a 3D variable) called storm-relative helicity @ some height. But > that height cannot be chosen. It is set at 1500 m, that is the only value. So > it appears that this is a variable that IDV reads/displays, rather than > calculates (or "derives"). Is that correct? Yes, that's a product that comes from NCEP, not derived by the IDV. We list single level products as 2D grids. I don't see it listed as a 3D variable from our THREDDS server. Is that what you are pointing to? Don Ticket Details =================== Ticket ID: LPB-751166 Department: Support IDV Priority: Normal Status: Closed