Thanks. It seems WWD means Wind Wave Direction, or the direction in which (surface?) wind and waves are moving, as reported for example from a buoy like that displayed at http://www.ndbc.noaa.gov/station_page.php?station=42035. It seems WWD is recorded as being from 0 - 360 degrees and is reported as a compass point, e.g., SSW.

By comparing the movement of clouds visible in that area with the little red flags shown when the "HDW-low" box is clicked at http://www.ssd.noaa.gov/goes/east/watl/loop-vis.html, the buoys (and/or vessels I suppose) nearest that latitude and longitude seem to be indicating (??) that the low pressure is rotating in a counter-clockwise pattern. Beyond that I don't see much else to help me understand what "MOVING SLOWLY WWD" might be saying. Again, thanks.