NCEP_GR_ANALYSIS NCEP_GR_ANALYSIS_00H NCEP_GR_ANALYSIS_06H NCEP_GR_ANALYSIS_12H NCEP_GR_ANALYSIS_18H NCEP_GR_FORC_03__00H NCEP_GR_FORC_03__06H NCEP_GR_FORC_03__12H NCEP_GR_FORC_03__18H NCEP_GR_FORC_06__00H NCEP_GR_FORC_06__06H NCEP_GR_FORC_06__12H NCEP_GR_FORC_06__18H NCEP_GR_FORC_12__12H NCEP_GR_FORC_15__12H NCEP_GR_FORC_18__12H NCEP_GR_FORC_21__12H NCEP_GR_FORC_24__12H NCEP_GR_FORC_27__12H NCEP_GR_FORC_30__12H NCEP_GR_FORC_33__12H NCEP_GR_FORC_36__12H