Chap 6
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6.2.1 Processed data (products) required for real-time and non-real time purposes shall reach the national Meteorological Service sufficiently quickly to be of effective use in its associated timescale. Both observational and processed data shall therefore be handled rapidly by both the GDPFS and the WIS/GTS. On the WIS/GTS, transmission of observational data shall have priority over the transmission of processed data.
6.2.2 Members shall establish programmes of output products for general distribution by their WMCs and/or RSMCs, taking into account requirements of other Members and the WIS/GTS operational arrangements required to handle and distribute these products.
Note: Overall lists of products, to be used as general guidance by Members in establishing output programmes for their WMCs and RSMCs, are found in Manual on GDPFS, Appendix II-6.
6.2.3 Each Member should state which products its NMC, RSMC or WMC wishes to receive from other centres.
6.2.4 In order to avoid overloading the WIS/GTS, Members should limit requests by their NMCs for products, taking into account the following considerations:
(a) Members should require output products from RSMCs with geographic specialization normally from one RSMC located in the same WMO Region (exceptions should be restricted to cases where the area, for which a Member needs to receive RSMC output products, is not covered by the products from one RSMC in the same Region);
(b) If there is an urgent need for a Member to receive the same product from more than one geographically specialized RSMC or WMC for special operational purposes, these requirements should be limited to a selection of two levels of analyses and prognoses;
(c) Members should request processed information from the centres most readily accessible on the GTS.
6.2.5 Transmission priorities for GDPFS products described in this section are intended as guidance to GDPFS centres on providing observational data and output products to the WIS/GTS in the proper sequence. As regards the relay and distribution of information by WIS centres, the provisions of the Manual on GTS and the Manual on WIS apply.
6.2.6 Priorities for the transmission of global model output products should be used when several such WMC and RSMC products are available at the same time. Priorities for transmission of regional model products should be based on the requirements for interregional exchange of RSMC products.
6.2.7 In case of WIS centre or communication link failure, WIS/GTS provisions for backup apply. After transmission outages that have disrupted the normal information exchange, normal transmission schedules of observational data should be resumed no later than the first main standard time of observation following the cessation of the outage. Procedures for the transmission of accumulated meteorological data should not interfere with the resumption of normal transmission schedules. If these data are redundant, they should not be transmitted.
6.2.8 Global model products and regional model products from RSMCs accumulated due to communication link disruption should be transmitted with the least possible delay. The regional model products should have a higher priority than global model products for transmission after outages.
6.2.9 Until such time as all centres are in a position to convert output products in GRIB, GRID and/or BUFR code form into pictorial form, Members should transmit certain of their RSMC products also in pictorial form in addition to alphanumeric and/or binary form.
Notes: (1) Members are encouraged to transmit processed information in the GRID, GRIB and/or BUFRcode forms. (2) As Members develop the capability at their centres for transforming these products from GRID, GRIB and/or BUFR to pictorial form, the pictorial transmission will be discontinued, where appropriate.
6.2.10 GDPFS centres participating in the exchange of monitoring results should implement standard procedures and use the agreed formats for the exchange of monitoring results.
NOTE: Procedures and formats for the exchange of monitoring results are given in Manual on GDPFS, Attachment II-9.
6.2.11 The designated RSMCs with activity specialization in the provision of international services for atmospheric transport modelling in radiological environmental emergency response shall implement agreed standard procedures and products, given in Manual on GDPFS, Appendix II-7.
6.2.12 The designated RSMCs with activity specialization in the provision of international services for atmospheric transport modelling in backtracking shall implement agreed standard procedures and products. Standards in the provision of international services by RSMCs for CTBT Verification support are given in Manual on GDPFS, Appendix II-9.
[derived from Manual on GDPFS, Part II, Section 5, end]
6 OTHER PROVISIONS COMMON TO ALL WIS CENTRES
[Editor's Note: This section will contain additional "standard practices, procedures and specifications" that apply to all three types of WIS Centres.]6.1 Data and Metadata Representation
6.2 Data Exchange in Support of GDPFS
[derived from Manual on GDPFS, Part II, Section 5, begin]6.2.1 Processed data (products) required for real-time and non-real time purposes shall reach the national Meteorological Service sufficiently quickly to be of effective use in its associated timescale. Both observational and processed data shall therefore be handled rapidly by both the GDPFS and the WIS/GTS. On the WIS/GTS, transmission of observational data shall have priority over the transmission of processed data.
6.2.2 Members shall establish programmes of output products for general distribution by their WMCs and/or RSMCs, taking into account requirements of other Members and the WIS/GTS operational arrangements required to handle and distribute these products.
Note: Overall lists of products, to be used as general guidance by Members in establishing output programmes for their WMCs and RSMCs, are found in Manual on GDPFS, Appendix II-6.
6.2.3 Each Member should state which products its NMC, RSMC or WMC wishes to receive from other centres.
6.2.4 In order to avoid overloading the WIS/GTS, Members should limit requests by their NMCs for products, taking into account the following considerations:
(a) Members should require output products from RSMCs with geographic specialization normally from one RSMC located in the same WMO Region (exceptions should be restricted to cases where the area, for which a Member needs to receive RSMC output products, is not covered by the products from one RSMC in the same Region);
(b) If there is an urgent need for a Member to receive the same product from more than one geographically specialized RSMC or WMC for special operational purposes, these requirements should be limited to a selection of two levels of analyses and prognoses;
(c) Members should request processed information from the centres most readily accessible on the GTS.
6.2.5 Transmission priorities for GDPFS products described in this section are intended as guidance to GDPFS centres on providing observational data and output products to the WIS/GTS in the proper sequence. As regards the relay and distribution of information by WIS centres, the provisions of the Manual on GTS and the Manual on WIS apply.
6.2.6 Priorities for the transmission of global model output products should be used when several such WMC and RSMC products are available at the same time. Priorities for transmission of regional model products should be based on the requirements for interregional exchange of RSMC products.
6.2.7 In case of WIS centre or communication link failure, WIS/GTS provisions for backup apply. After transmission outages that have disrupted the normal information exchange, normal transmission schedules of observational data should be resumed no later than the first main standard time of observation following the cessation of the outage. Procedures for the transmission of accumulated meteorological data should not interfere with the resumption of normal transmission schedules. If these data are redundant, they should not be transmitted.
6.2.8 Global model products and regional model products from RSMCs accumulated due to communication link disruption should be transmitted with the least possible delay. The regional model products should have a higher priority than global model products for transmission after outages.
6.2.9 Until such time as all centres are in a position to convert output products in GRIB, GRID and/or BUFR code form into pictorial form, Members should transmit certain of their RSMC products also in pictorial form in addition to alphanumeric and/or binary form.
Notes: (1) Members are encouraged to transmit processed information in the GRID, GRIB and/or BUFRcode forms. (2) As Members develop the capability at their centres for transforming these products from GRID, GRIB and/or BUFR to pictorial form, the pictorial transmission will be discontinued, where appropriate.
6.2.10 GDPFS centres participating in the exchange of monitoring results should implement standard procedures and use the agreed formats for the exchange of monitoring results.
NOTE: Procedures and formats for the exchange of monitoring results are given in Manual on GDPFS, Attachment II-9.
6.2.11 The designated RSMCs with activity specialization in the provision of international services for atmospheric transport modelling in radiological environmental emergency response shall implement agreed standard procedures and products, given in Manual on GDPFS, Appendix II-7.
6.2.12 The designated RSMCs with activity specialization in the provision of international services for atmospheric transport modelling in backtracking shall implement agreed standard procedures and products. Standards in the provision of international services by RSMCs for CTBT Verification support are given in Manual on GDPFS, Appendix II-9.
[derived from Manual on GDPFS, Part II, Section 5, end]