Subject : Warning of Expected Abnormal Wave Conditions.
Issued : Saturday 27 July 2002 at 13h30 UTC
Abnormally high waves are possible in the Agulhas Current between offshore Algoa Bay and East London from this evening Saturday 27 July 2002, moving up to Durban overnight
Warning valid : Today Saturday 27 July 2002 22h00 UTC until tomorrow Sunday 28 July 10h00 UTC
WMO GMDSS Marine Broadcast System
United Kingdom National Report
The United Kingdom has responsibility as Preparation and Issuing Service for Metarea I; this is provided through the Navtex system for coastal waters, and SafetyNETTM for all other areas. Forecast content and format is designed to follow the practices laid down in the WMO Manual of Meteorological Services (WMO-No 558).
Navtex is broadcast via stations at Niton, Cullercoats and Portpatrick in the UK; changes to the Navtex limits have meant that more westerly areas are also broadcast by the Irish Coastguard from stations at Valentia and Malin Head.
SafetyNETTM services are issued to CES Goonhilly in the UK, for transmission via Inmarsat-C broadcast, which is monitored by the Met Office; it is also noted that forecasts for Metarea III, issued by Greece, are transmitted to the UK for onward broadcast.
2. International (518) Navtex Service
Forecasts to meet this service requirement are prepared every 12 hours, and passed (by telex) to the UK Maritime & Coastguard Agency (MCA), who are responsible for the Navtex broadcast in Navarea I.
Issued via Niton (0700 & 1900, although these times are due to change to 0840 & 2040), Cullercoats (0900 & 2100) and Portpatrick (0620 & 1820), forecasts for Coastal Areas (the “Shipping Forecast”) are issued every 12 hours; forecasts cover the area from 15 Deg W to the European mainland, and north to Southeast Iceland. The forecast period is a basic 24 hours ahead, with a brief outlook for a further 24 hours; additionally, an “Extended Outlook” (for a further 3 days) is issued at 2300 (Niton, changing to 0040), 0100 (Cullercoats) and 0220 (Portpatrick).
In order to meet the change of areas to 20 Deg W, introduced in 2000, these forecasts are passed to Ireland for transmission via their Valentia and Malin Head broadcasts (at 0740 & 1940 for Valentia, and 1040 & 2240 for Malin Head).
Gale Warnings for any of these areas are broadcast by the appropriate Navtex broadcast station as soon as received from the Met Office: in addition, they area also repeated once during the next routine broadcast from that station.
3. National (490) Navtex Service
With the introduction of a national Navtex service, a more detailed forecast is now provided for the inshore waters of the United Kingdom. As with information for the International Service, forecasts are issued every 12 hours and passed by telex to the UK MCA for broadcast.
Issued via Niton (0520 & 1720), Cullercoats (0720 & 1920) and Portpatrick (0820 & 2020), an “Inshore Waters” forecast is issued every 12 hours; forecasts cover the coastal area around the UK in sixteen specific areas out to 12 miles offshore (and 60 miles around the Shetland Islands). The forecast period is a basic 24 hours ahead, with an outlook for a further 24 hours (initially, the periods were 12 hours with a 24 hour outlook, but following feedback from a number of users, this was changed to 24hours with a 24 hour outlook); additionally, a brief outlook (for a further 3 days) is also included within the forecast.
It is also intended that “Strong Wind Warnings” (which are issued by the UK for areas up to 5 miles offshore when winds of Force 6 or stronger are expected) will be broadcast on this service.