Large Roll Vortices Exhibited by Post-Tropical Cyclone Sandy during Landfall

Roll vortices are frequent features of a hurricane’s boundary layer, with kilometer or sub-kilometer horizontal scale. In this study, we found that large roll O (10 km) wavelength occurred over land in Post-Tropical Cyclone Sandy (2012) during landfall on New Jersey. Various characteristics were corroborated by analyses Doppler radar observations, 500 m resolution Weather Research and Forecasting (WRF) simulation, an idealized vortex model. The always linear-shaped, their wavelengths 5–14 km generally larger than any previously published for tropical cyclone land. Based surface wind observations simulated WRF fields, significantly increased the probability hazardous winds likely caused observed patchiness treefall Sandy’s landfall.