Scripting , however , seems to work instead of normal analysis contours ( if I want to plot °C temperature contours I can still do so , but through the means of a script ) . Also , regarding the color of the contourlines , I'm always getting BLUE contour lines , regardless of which values I'm using in the Color- argument . Must be something I'm doing wrong here

The grib-data I was trying to download and import was retrieved from this site :
http://www.emc.ncep.noaa.gov/data/
and then the AVN-folder , the file had a size of about 20Mb