Meteorological products and observational data will be transmitted from
the Washington WAFC / Washington RTH to the contractor facility using
the WMO X.25 protocol specifications. Each class of data is separate in a
Permanent Virtual Circuit (PVC). The generic types of data content of each PVC
is described below.
A complete list of data by WMO heading is
also available for review. The WMO heading list is updated monthly.
All PVCs are available as output from the VSAT equipment at the
receiving site on a single X.25 port from the Memotec PAD at 38.4 Kbps for the
- The first three numbered PVCs will be used to carry the WAFS data broadcasts [Descriptions ].
- The second three PVCs will be used to carry the RMTN-IV data
broadcasts [ Descriptions ] (includes the old ANMET
The term OPMET will be used for all data in the
alphabet 5 (ASCII code form) provided for the WAFS broadcast; and the term RMTN-IV will be used for PVC 4, PVC 5, and PVC 6, which includes data in
alphabet 5 (ASCII code form), binary model products, and facsimile/image
products for the WMO Broadcast.
PVC-1 WAFS GRIB Products [
33,925,456 octets in 7,908 bulletins ]
PVC-2 WAFS Alphanumeric Data Bulletins (OPMET Broadcast) [ 6,739,777 octets in 18,001 bulletins ]
PVC-3 WAFS T4 Graphics Products [
46,358,720 octets in 3339 chart segments ]
The WAFC Washington compiles the METAR & TAF
collectives for broadcast over the WAFS alphanumeric channel, to reduce the
transmission of redundent reports, and to standardize & reduce the number
WMO headings required for dessimination.
PVC-4 RMTN-IV GRIB Products [
3,572,124 octets in 786 bulletins ]
PVC-5 GTS Alphanumeric Data Bulletins (WMO
Broadcast) [ 1,751,654 octets in 2,785 bulletins ]
PVC-6 RMTN-IV T4 Graphics Products [
5,970,471 octets in 911 chart segments ]
The directory list of WMO Headings switched to these channels are provided for your information. The list will be
updated periodically through the year.