An upper level system in the northwestern U.S. will produce another day of thunderstorms across the West and into the Central U.S. Primary threats will be damaging winds and large hail. Very large hail and significant winds will be possible from the Northern Rockies into the Northern Plains. Strong winds and dry thunderstorms keep fire weather threats elevated to critical in the Great Basin. Read More >
and National Tables
The tables that define the designators within the World Meteorological Organization Abbreviated Heading for bulletin identification to exchange data and products on the Global Telecommunication System are provided here for convenient access. The WMO published tables are contained in their Manual 386 PART II, attachment II-5. The tables provided here include all known current designator definitions including any changes up through CBS XII Session ( Geneva 2000 ) for implementation by November 2001. There are a few places in these tables where U.S. National Practices definitions are included, and/or are pending changes submitted through the Technical Study Groups in the next session of CBS.
Some WMO publications are available from the WMO in Geneva, Switzerland. The WMO Manual on Codes (Manual 306) can be found on their server. The tables from WMO Manual 386 are reproduced here to help in both encoding and decoding the communication headers used extensively throughout the meteorological community. The identifing header has a standard structure as shown here.
The tables provided here can be used to both construct communication headings and for interpretation of the heading to determine the basic WMO code form and content of the bulletin.
The first (initial) Table A in this group also defines the maximum bulletin size for exchange on the GTS. Bulletins larger than this size must be segmented into parts to insure successful relay through telecommunication switching centers. This initial table defines the T1 "Data Type" and is a matrix table. From this table is access to all of the other defining tables through the designator parts within the heading structure model shown above.
