200 mb Plot

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The 200 millibar (mb) map plots a variety of information collected by weather balloons and represents atmospheric conditions at an altitude of approximately 12,000 meters (39,000 feet). The map displays:
  • The air temperature (degrees Celsius) in red
  • The dew point temperature (degrees Celsius) in green
  • The height of the 200 mb level (decameters) in black. For example, "1188" means 11,880 meters.
  • Winds (knots) – The wind barb is an "arrow" that depicts the wind speed and direction. The "feathers" of the arrow indicate the wind speed while the blank end of the arrow indicates the direction the wind is blowing toward.
Also shown on the map as brown lines are contours of the height of the 200 mb level (decameters). These are at intervals of 120 meters.

This map is updated twice a day.