Vertical Wind Shear (IMAGE) University of Wisconsin-Madison Caption Pattern showing how vertical wind shear (VWS) varies in the Atlantic. When shear is abnormally low in the tropics, it is abnormally high along the US coast. The lower dashed box shows the tropical Atlantic and the upper dashed box is where hurricanes must pass before striking the US coast. Credit Courtesy of James Kossin Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.