The HCXN25 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (N): 108 hours forecast T1ii (H25): 250 hPa (Remarks from Volume-C: H+ 108 (GLOBAL MODEL) VORTICITY 250 HPA)

The HCXM25 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (M): 96 hours forecast T1ii (H25): 250 hPa (Remarks from Volume-C: H+ 96 (GLOBAL MODEL) VORTICITY 250 HPA)

The HCXJ70 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (J): 60 hours forecast T1ii (H70): 700 hPa (Remarks from Volume-C: H+ 60 (GLOBAL MODEL) VORTICITY 700 HPA)

The HCXL92 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (L): 84 hours forecast T1ii (H92): 925 hPa (Remarks from Volume-C: H+ 84 (GLOBAL MODEL) VORTICITY 925 HPA)

The HCXO92 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (O): 120 hours forecast (5 days) T1ii (H92): 925 hPa (Remarks from Volume-C: H+ 120 (GLOBAL MODEL) VORTICITY 925 HPA)

The HCXJ25 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (J): 60 hours forecast T1ii (H25): 250 hPa (Remarks from Volume-C: H+ 60 (GLOBAL MODEL) VORTICITY 250 HPA)

The HCXR92 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (R): 156 hours forecast (7 days) T1ii (H92): 925 hPa (Remarks from Volume-C: H+ 156 (GLOBAL MODEL) VORTICITY 925 HPA)

The HCXA70 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (A): Analysis (00 hour) T1ii (H70): 700 hPa (Remarks from Volume-C: H+ 00 (GLOBAL MODEL) VORTICITY 700 HPA)

The HCXS92 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (S): 168 hours forecast T1ii (H92): 925 hPa (Remarks from Volume-C: H+ 168 (GLOBAL MODEL) VORTICITY 925 HPA)

The HCXW70 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HC): Vorticity A1 (X): Global Area (area not definable) A2 (W): Not assigned T1ii (H70): 700 hPa (Remarks from Volume-C: H+ 54 (GLOBAL MODEL) VORTICITY 700 HPA)