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Charles W. Lafon and Steven M. Quiring

fundamental importance in defining the conditions that permit fire. Thus climate helps shape geographic patterns of fire ( Krawchuk et al. 2009 ). A long-recognized ( Sauer 1952 ) and recently articulated ( Meyn et al. 2007 ; Parisien and Moritz 2009 ) generalization about climate and fire is that locations with intermediate moisture provide the best fire “habitats.” These include, for example, tropical savannas and dry temperate forests. More extreme environments burn less often: for example, arid

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

, and positive values indicate wetter than normal conditions. Each standardized hydrologic time series was then correlated with corresponding SPI and SPEI using Pearson's linear correlation coefficient. Spatially averaged SPI and SPEI data from within the watershed boundaries of each water body were used in the correlations. 4. Results When examining time series of SPI and SPEI at the 1-month time scale, it is evident that SPI reaches a maximum negative value consistently through time ( Figure 2

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Richard R. Heim Jr. and Michael J. Brewer

and regional boundaries. These high-level products are developed using some of the best quality climate information available ( Peterson and Easterling 1994 ), provide a broad-brush look at global drought conditions, and are presented as plain text and static images to encourage use in limited bandwidth areas. Because they use common base periods, they are appropriate for comparing drought status between locations around the world but do not necessarily represent the severity of a drought at an

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

( Field et al. 2007 ). River streamflows will also decrease as demonstrated by the downscaling experiments over the Colorado River basin ( Christensen et al. 2007 ). While most models project a drier Southwest, the spread among the projected streamflow is large. An important question is whether the drought and persistent wet episodes in the CMIP3 model simulations are realistic. What are the conditions that a model must capture in order to simulate realistic drought? The answers to these questions

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