The storm could be at or near Category 3 strength when it makes landfall
Major Hurricane Roslyn is heading for the west coast of Mexico and is expected to roar ashore at or near Category 3 strength somewhere in the states of Jalisco or Nayarit late Saturday or early Sunday. The National Hurricane Center warns that “preparations … should be rushed to completion” for those within Roslyn’s path, the agency sounding the alarm for expected “damaging winds, a dangerous storm surge … [and] heavy rainfall [that] could lead to flash flooding and mudslides.
The greatest surge will occur just south of where Roslyn’s center makes landfall. That’s because the storm, like all large-scale low-pressure systems in the Northern Hemisphere, is spinning counterclockwise; that means winds south of the eye will be aimed onshore. That will efficiently push water toward the coastline.
Storm surge risk is generally less on Mexico’s west coast than on its Gulf Coast because the slope of the continental shelf is more abrupt on the west coast. Without the aid of the gently sloping seabed that exists in the gulf, a storm on the Pacific side is less able to push large volumes water on to the coastline.
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