This is an immensely complex course work to do so.  Start with this ... with scientific thesaurus in tow where needed: https://www.gfdl.noaa.gov/bibliography/related_files/jlu0701.pdf The HC's northern boundary where it terminates into the westerlies is not fix boundary or 'curb' in free air either.  It's really along where the gradient steepens, and the jets ( westerlies ) ablate past.. .It bulges, up then collapsing down ... over time, while the mean width appears to be growing since