Observations are color coded by type. Buoys are shown in red, ships are shown in blue and C-MAN (Coastal-Marine Automated Network around the U.S.) are shown in magenta.

Grey contours are sea level pressure in millibars (mb). The labels are "short hand" that show just the last two digits: 998 mb becomes "98", 999 mb is "99" 1000 mb is "00" and 1001 mb is "01" and so on.