FIGURE 6.1 Photograph taken on March 29, 2004, from the site of the Sulphur Mountain NEXRAD looking approximately east-southeast. SOURCE: Julie Demuth, National Research Council.

Gabriel Rivers flow into the ocean. The latter two rivers have a total drainage area of 3056 km2.

The forecast process requires a forecaster to be cognizant not only of the antecedent hydrological and current meteorological conditions that may trigger a flash flood, but also of modifications of approaching weather systems as they impinge on the complex, mountainous terrain surrounding the highly populous urban areas in southern California. The impact of urbanization on both weather patterns and water runoff and the potential for recent fire-burned regions to modify watershed response and runoff must



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