Transcription of Standardized Precipitation Index User Guide
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Standardized Precipitation Index user GuideWMO-No. 10902012 WMO-No. 1090 Standardized Precipitation Index user GuideWMO-No. 1090 World Meteorological Organization, 2012 The right of publication in print, electronic and any other form and in any language is reserved by WMO. Short extracts from WMO publications may be reproduced without authorization, provided that the complete source is clearly indicated. Editorial correspondence and requests to publish, reproduce or translate this publication in part or in whole should be addressed to:Chair, Publications BoardWorld Meteorological Organization (WMO)7 bis, avenue de la Paix Tel.: +41 (0) 22 730 84 Box 2300 Fax: +41 (0) 22 730 80 40CH-1211 Geneva 2, Switzerland E-mail: 978-92-63-11091-6 NOTEThe designations employed in WMO publications and the presentation of material in this publication 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 of its authorities, or concerning the delimitation of its frontiers or mention of specific c
STANDARDIzED PRECIPITATION INDEx USER GUIDE 3 1. BACKGROUND Drought is an insidious natural hazard that results from lower levels of precipitations than what is considered normal. When this phenomenon extends over a season or a longer period of time, precipitation is insufficient to meet the demands of human activities and the environment.
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