---- The bulletin collects HYDRA reports: FM 67 (HYDRA, Report of hydrological observation from a hydrological station). (Refer to WMO No.306 - Manual on Codes for the definition of WMO international codes) ---- The SRYG20 TTAAii Data Designators decode (2) as: T1 (S): Surface data. T2 (R): Hydrological (river) reports. A1A2 (YG): Serbia. (2: Refer to WMO No.386 - Manual on the GTS - Attachment II.5) ---- WMO No.9 - Volume C1 'Remarks' field: HYDROLOGICAL REPORTS

The SREO40 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (EO): Estonia (Remarks from Volume-C: HYDROLOGICAL REPORT)

The SRYG70 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological A1A2 (YG): Serbia

The SRLT40 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (LT): Lithuania(The bulletin collects reports from stations: 74229;74384;74801;74805;)

The SRLT45 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (LT): Lithuania(The bulletin collects reports from stations: 73440;73477;73604;73679;)

The SRLT41 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (LT): Lithuania(The bulletin collects reports from stations: 74038;74211;74906;)

The SROS20 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (OS): Austria (Remarks from Volume-C: HYDRO)

The SRBU40 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (BU): Bulgaria (Remarks from Volume-C: HYDROLOGICAL REPORTS)