Some recent studies have utilized flight-level（700 mb） winds to document the maximum wind speeds(V_max)and radius of V_max(R_max) of the original and secondary eyewalls during 24 Atlantic hurricane eyewall replacement cycles（ERC）.In this study,Hurricane Wind（H*Wind） analyses of Atlantic hurricanes during 2003-2005 are utilized to document changes in the outer vortex surface wind profile beyond the secondary eyewall,with a focus on the radii of gale-force winds(R₃₄) that are often defined operationally as size changes.In Mode 1,complete and partial ERCs in which the pre-,during-,and post-ERC outer wind profiles have approximately the same shape,the outward displacements of R_max leads to size(R₃₄) increases as much as 100 km.Mode 2 ERCs are characterized by sharpened wind profiles outside the secondary eyewall that offset the larger R_max radii to produce only small R₃₄ increases.While statistically significant results are not obtained,the differences in size changes for Mode 1 and Mode 2 SEF cases suggest practical significance for forecasts and warnings.