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  • Drought: Advances in Monitoring, Preparedness, and Understanding Drought Characteristics x
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Ashok K. Mishra and Vijay P. Singh

Survey (USGS Project ID 2009TX334G) through the project “Hydrological Drought Characterization for Texas under Climate Change, with Implications for Water Resources Planning and Management.” References Farge , M. , 1992 : Wavelet transforms and their applications to turbulence . Annu. Rev. Fluid Dyn. , 24 , 395 – 457 . Grinsted , A. , J. C. Moore , and S. Jevrejeva , 2004 : Application of the cross wavelet transform and wavelet coherence to geophysical time series . Nonlinear

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Richard R. Heim Jr. and Michael J. Brewer

regional drought prediction capabilities for variables and scales most relevant to user needs on subseasonal to centennial time scales. The action plan developed by the workshop had applications to a GDIS, with the key recommendations including the following: (i) develop a drought catalogue that summarizes our current understanding of the causes of drought worldwide, to include the important time scales (e.g., subseasonal, seasonal, decadal, centennial) and mechanisms [e.g., ENSO, Pacific decadal

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Daniel J. McEvoy, Justin L. Huntington, John T. Abatzoglou, and Laura M. Edwards

supplies in the Great Basin are derived from spring snowmelt runoff, groundwater recharge, and storage, which all have large temporal variability due to climate variability. Therefore, it is crucial for water resource managers and developers to understand how drought conditions, on both long and short time scales, will affect water availability. Drought indices such as the PDSI and the SPI have been used in the past by water resource managers and incorporated into drought management plans ( Wilhite and

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Sergio M. Vicente-Serrano, Santiago Beguería, Jorge Lorenzo-Lacruz, Jesús Julio Camarero, Juan I. López-Moreno, Cesar Azorin-Molina, Jesús Revuelto, Enrique Morán-Tejeda, and Arturo Sanchez-Lorenzo

drought plans ( Wilhite 1996 ; Wilhite et al. 2007 ). Recent works have reviewed the development of drought indices and compared their advantages and drawbacks ( Heim 2002 ; Keyantash and Dracup 2002 ; Mishra and Singh 2010 ; Sivakumar et al. 2010 ). However, very few studies have performed robust statistical assessments by comparing different drought indices, which may allow recommending the preferential use of one of them based on objective criteria ( Guttman 1998 ; Keyantash and Dracup 2002

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Kingtse C. Mo, Lindsey N. Long, and Jae-Kyung E. Schemm

1. Introduction Drought is one of the major water management issues facing the western region of the United States. In recent years, the western interior region has suffered many episodes of long-term droughts. For example, the Colorado River basin suffered severe drought for 8 years from 2000 to 2007. The unregulated inflow to Lake Powell was below normal for 7 out of 8 years during that period. Under these circumstances, careful planning when knowing the future projections of water resources

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