DISCLAIMER
Opinions expressed in this publication are those of the authors and do not engage the World
Meteorological Organization (WMO). The designations employed and presentation of material in this
publication, including maps, do not imply the expression of any opinion whatsoever on the part of
WMO concerning the legal status of any country, territory, city or area, or concerning the
delimitations of its frontiers or boundaries.
The mention of specific companies or of certain products does not imply that they are endorsed or
recommended by WMO in preference to others of a similar nature that are not mentioned.
World Meteorological Organization (WMO)
7 bis, avenue de la Paix,
Case postale No. 2300
CH-1211 Geneva 2
Switzerland
E-mail:
wmo@wmo.intWeb: www.wmo.int
This publication may be freely quoted or reprinted, except for resale.
Acknowledgement of the source is requested. Requests for the reproduction or translation of this
publication should be directed to the publisher.
ISBN 92-63-11021-2
Copyright © WMO 2007
All rights reserved.
Geneva, Switzerland.
Published by Tudor Rose on behalf of the WMO.
www.tudor-rose.co.ukAdditional copies of this publication are available
for purchase from the WMO or Tudor Rose.
Tudor Rose




