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Information on this is quite difficult to find, but I did find something. A system with a statement of central pressure is often assigned an invest. I don't know how useful this is, or even if it is completely correct, but it seems to be one of the criteria needed. Note that the invest in the E. Pacific has a low of 1008mb associated with it. I'm sure there are other things needed to designate a system an invest, but this seems to be one of them. |