Saddle point between Low and Hi pressure systems where flow is weak and variable
<a href="//commons.wikimedia.org/wiki/User:Pierre_cb" title="User:Pierre cb">Pierre cb</a>
Based on <a href="//commons.wikimedia.org/wiki/File:Zadelgebied.svg" title="File:Zadelgebied.svg">File:Zadelgebied.svg</a>