Topic: geostrophic wind scale map's broken line

[aslo]

hello,

I've seen the geostrophic wind scale maps and there are a broken line with a number (e.g.: 546).
What does it mean?
e.g.:
http://euro.wx.propilots.net/
FRONTS & SLP
surface 00-120hr

thank you!
aslo

[Downlinerz2]

   May be different on some maps but is likely the geopotential height in meters.

[aslo]

Dear Downlinerz2,

thank you, I'll see about it

hello

[Scalphunter]

 it an upper level barometeric reading.

[alsare]

Thank you for outstanding service