My real question concerns the degree to which forward velocity adds to the forward right quadrant winds. At the nuts and bolts level, does the Vortex data measure storm relative wind or do they measure earth relative wind?
That's what they're using to posit the NHC projections. If they measure storm relative winds, then that will add to the forward velocity. If they measure earth relative winds, it's already factored in.
I don't think it's factored in.