Hi guys
The wetterzentrale maps show the geopotential in gpdm (decametre) as contours but in gpm (metre) in the spread coloring. This means that ECMWF calculates a spread/standard deviation (measured in decametre) that is actually 10 times smaller than shown. We discussed this several times in the wz forum but the diagrams weren't adjusted so far.
Tot ziens,
Leo