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NCEP Weather Analyses for "The Perfect Storm" October 27 - November 2, 1991
The images above show the Sea Level Pressure and 500 millibar (mb) analyses every 6 hours from 0000 UTC October 27, 1991 through 1800 UTC November 2, 1991.
The animation on the left shows the Sea Level Pressure (white contours) and the 925 mb winds. Pressure is in mb, and contoured every 4 mb. Winds show direction and speed, with speed represented by the plotted barbs on the symbol (half barb=5 knots, full barb=10 knots, flag=50 knots).
The animation on the right shows the 500 mb heights (in decameters), contoured every 6 decameters (60 meters).