"MCC" wrote in message ...

Is there a good reason why isobars on a surface pressure chart are spaced
t 4 mb? I would have thought 5 mb spacing would have made more sense.
IA
-
CC

4-mb gives slightly more detail and also can be easily divided by 2 to give
2-mb spacing if desired.

Ian Bingham,
Inchmarlo, Aberdeenshire.