Operational Newsletter July 2004

WORLD WEATHER WATCH
Operational Newsletter

July 2004

MEETINGS		EDITORIAL
World Weather Watch		Dear Reader, This Newsletter is disseminated free of charge by the World Meteorological Organization Secretariat. Its objective is to provide World Weather Watch (WWW) Centres with urgent notifications and a summary of the latest operational information on the World Weather Watch and Marine Meteorological Services, in particular on: The Global Observing System The Global Telecommunication System The Global Data-Processing and Forecasting System Data Management Codes Marine Meteorological Services PLEASE check our World Weather Watch home page for the most recent edition. Alternatively complete the subscription form (if you havn’t already done so) and we will contact you when the Newsletter is available.
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		GLOBAL OBSERVING SYSTEM
Acknowledgements The WMO Secretariat would like to express its appreciation to all those who have contributed material to the "Operational Newsletter".		PUBLICATIONS NO. 9: VOLUME A - OBSERVING STATIONS
		Updates to Volume A NOTIFICATION FROM NEW ZEALAND (see METNO A2604) Station 93786 LYTTELTON was automated and renamed LYTTELTON AWS on 11 June 2004. NOTIFICATION FROM PANAMA (see METNO A3004) Due to technical reasons station 78807 COROZAL OESTE suspended upper-air soundings between the period 26 June - 16 July 2004. NOTIFICATION FROM AUSTRALIA (see METNO A3004) Station 89571 DAVIS in the Antarctic temporarily terminated upper-air soundings as from 5 July until end October 2004. Station 89611 CASEY in the Antarctic temporarily terminated the 1200 UTC upper-air soundings as from March until end October 2004. FEEDBACK for Observing network: Explanatory Note Feedback Form
		AUTOMATIC MARINE STATION
		National Programmes: Australia Canada France New Zealand United Kingdom United States of America European Group on Ocean Stations ARGOS monthly status report (due to technical difficulties the current report is unavailable)
		GLOBAL TELECOMMUNICATION SYSTEM
		VOLUME C1 - CATALOGUE OF METEOROLOGICAL BULLETINS
		NOTIFICATION FROM RTH OFFENBACH: ED06701o.txt and EDZW701o.txt (see METNO MC2804.txt) ED07801o.txt and EDZW801o.txt (see METNO MC3104.txt) NOTIFICATION FROM RTH TOULOUSE: LF01705O.txt (see METNO MC2804.txt)
		The Global Data-Processing and Forecasting System
		EARLY DELIVERY FORECASTING SYSTEM
		NOTIFICATION FROM ECMWF: On 29 June 2004 ECMWF implemented the Early Delivery Forecasting System which comprises two main 6-hour 4D-Var analysis and forecast cycles for 00 and 12 UTC (DA stream) with two additional 12-hour 4D-Var analysis (DCDA stream) and first guess forecast cycles. These additional cycles are run with a delayed cut-off time of 14 hours (with respect to the nominal analysis times). The analysis observation windows are 21-09 UTC for the 00 UTC analysis and 09-21 UTC for the 12 UTC analysis. The first guess forecasts are used to initialise the main operational 00 and 12 UTC assimilation and forecast cycles. Trials have shown that the quality of the two first guesses is sufficiently high to allow an early running of the 6-hour 4D-Var assimilations at around 0400 and 1600 UTC without any loss in quality in the ensuing forecasts compared with the previous operational system. ECMWF products on the GTS are now inserted some three to four hours earlier in line with the timing of the Early Delivery Forecasting System.

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