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Steve or Scott, In the gb2prob.c routine, copying of the cpds field to the parameter name overwrites the GEMPAK parameter name, rather than appending. The gbensemble code only stores the extension in pds.extension- whereas gb2prob modifies the parameter name. I'm assuming: if ( ext_flag == 1 ) { strcpy ( param, cpds ); } should be if ( ext_flag == 1 ) { strcat ( param, cpds ); } The noaaport grib2 data from KNHC uses this probability for wind speeds. Steve