Unlike tropical cyclones, extratropical cyclones typically form within the middle latitude of the globe (between 30° and 60°) outside the tropical region, producing cold torrential rain and strong winds.
Below are sample animations of historical flood events, caused by extratropical cyclones, used in developing the Hudson River Flood Decision Support System
The map animations show colors for water level, arrow vectors for wind velocity, and black or white lines for isobars (lines of constant atmospheric pressure). Some tropical cyclone maps also show the storm track as a unmoving black line. Inset x-y axes for some animations also show the time history of the water level for New York Harbor (black) and Albany (green).