I think a water vapor animation really helps to illustrate this process with TC #Fay. There was already pre-existing dry mid-level air over Virginia. This dry air is advected & then imported into Fay's core by westerly vertical wind shear, choking off nearby convection. https://t.co/ZGATr82mii pic.twitter.com/VA5WrhS61o

— Philippe Papin (@pppapin) July 10, 2020