The figure above is an upper-level isobaric chart, in this cass 300mb for September 20, 2000 at 12oo UTC. Where the isoheights are nearly straight, the wind “flagpoles” point parallel to the lines of equal height. The “flags” on the flagpoles indicate that the strongest winds are observed by the rawinsondes where the isoheights are closest together.

The circle in the station model is centered on the latitude and longitude of the city where the weather balloon was launched. For the upper air maps, temperature is plotted where the number 10 is on a clock (TT) in °C. The dew point temperature (TdTd) is plotted below (at about 8 o'clock) and in the same units as temperature. 

Wind speed and direction are represented in the station model plot by the position of the “flag pole.” The pole points (dd) to the direction from which the wind is coming. You can tell which direction the “pole” is pointing by the end that has the flags or barbs (ff).

The height of the pressure surface of the constant pressure map (hhh) is truncated to keep clutter off the map. You decode those heights as follows: