SkewT-LogP

Sounding diagrams are used for displaying upper-air sounding data.  They are used to plot sounding data from radiosondes, rawinsondes, dropsondes, pibals, or even non-conventional sources such as acoustic, doppler-lidar, or microwave sounders.  Below are the three most popular sounding diagrams. 

                Skew-T Log-P                                                         Emagram                                                            Tephigram

The above example diagrams were produced by the RAOB program.  Each diagram displays the standard temperature and pressure scales, adiabats, and mixing ratio lines.  A wind plot area is also included at the right side along with a standard height scale. 

Skew-T Log-P.  This is the most popular diagram in the United States.  It is best for displaying data up to the 100 mb level.  Diagram construction is similar to the Emagram (see below), but the temperature lines are tilted about 45 degrees to the right, which orients the sounding plot into a convenient vertical image.

Emagram.  This diagram is popular in Europe and the United States.  It is typically used to display data up to the 400 mb level.  Due to its straight, vertical temperature scale, it is ideal for visually identifying thermal characteristics such as inversions.

Tephigram.  This diagram is popular in England.  Its construction algorithms are more complex than the above diagrams and is therefore rarely used by automated plotting programs. 

See this page for a list of popular Skew-T Log-P diagram web sites.

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