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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

Support for this study was provided by Award No. NCC5-202 between the National Academy of Sciences and the National Aeronautics and Space Administration.

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Cover: Collage of images from the Tropical Rainfall Measuring Mission (TRMM). The globes show probable rainfall as indicated by the TRMM Microwave Imager. TRMM's precipitation radar gathered data on the amount and distribution of rainfall and clouds in Hurricane Bonnie during August 1998. The colors of the profile represent surface rainfall rates varying from 0 mm/hr (dark blue) to 50 mm/hr (dark red). Images courtesy of C. Morales, G. Shirah, R. Simmon, and M. Sutton, NASA GSFC.

Copyright 1998 by the National Academy of Sciences. All rights reserved.

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