The ISND20 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 0100, 0200, 0400, 0500, ... UTC) A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NilReason)
The SILV21 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SI): Intermediate synoptic hour A1A2 (LV): Latvia (Remarks from Volume-C: NilReason)
The IUXD01 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IU): Upper air T1T2A1 (IUX): Other upper air reports A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NilReason)
The ISCD10 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISC): Climatic observations from land stations A2 (D): 90°E - 0° northern hemisphere(The bulletin collects reports from stations: 26346;ALUKSNE;26406;LIEPAJA;26544;DAUGAVPILS;) (Remarks from Volume-C: XXX)
The SMLV41 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SM): Main synoptic hour A1A2 (LV): Latvia (Remarks from Volume-C: NilReason)
The SILV40 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SI): Intermediate synoptic hour A1A2 (LV): Latvia (Remarks from Volume-C: NilReason)
The SILV41 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SI): Intermediate synoptic hour A1A2 (LV): Latvia (Remarks from Volume-C: NilReason)
The ISCD60 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISC): Climatic observations from land stations A2 (D): 90°E - 0° northern hemisphere(The bulletin collects reports from stations: 26346;ALUKSNE;26406;LIEPAJA;26544;DAUGAVPILS;) (Remarks from Volume-C: with daily values)
The IUSD10 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IU): Upper air T1T2A1 (IUS): Radiosondes/pibal reports from fixed land stations (entire sounding) A2 (D): 90°E - 0° northern hemisphere(The bulletin collects reports from stations: 26435;SKRIVERI;)
The ISMD40 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISM): Main synoptic observations from fixed land stations A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NilReason)