National Weather Service United States Department of Commerce

Atmospheric River in the Pacific Northwest and Northwest California Early This Week

An atmospheric river event will bring heavy rains and rising snow levels to the Pacific Northwest and northwest California early this week. Snow levels will rise above 8,000 feet, and 4 to 7 inches of rain is forecast for the southwest facing slopes of the mountains. Minor river and localized flooding will be possible. In the east, winds decrease by Monday, and the week will be relatively dry. Read More >

 

Heading Tables

WMO Tables from Manual 386

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.

WMO Abbreviated Heading Reference Model
T1T2 A1A2ii   CCCC

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.