This loop of GOES-8 visible imagery shows the westward motion of a low-level mesoscale vortex over the western North Atlantic Ocean (centered near 31 N latitude, 73 West longitude) on 15 September 1998.

The first image (at 11:45 UTC) shows the 12:00 UTC ETA model 1000 hPa wind streamline analysis. Surface ship reports (temperature, pressure, and wind barbs) are also plotted on the imagery.