Aniuk Consulting, LLC, proposes to create a GIS software toolkit for monitoring areal snow cover extent and producing streamflow forecasts. This toolkit will be packaged as multiple extensions for ArcGIS 9.2 and provides users with a means for easily ingesting NASA EOS satellite images (for snow cover analysis), preparing hydrologic model inputs, and visualizing streamflow forecasts. Primary products include: a technique for predicting the presence of snow under clouds in satellite images; a software tool for producing gridded temperature and precipitation forecasts; and a suite of tools for visualizing hydrologic model inputs and results. The toolkit will be an expert system designed for operational users that need to generate numerous streamflow forecasts accurately and in a timely-fashion without having to hassle with the science and physics behind the hydrologic model. This proposal targets the "Data Analyzing and Processing" research initiative announced by the Goddard Space Flight Center by exploiting spatial tools in order to increase the utility of scientific research data, models, and visualizations. The beauty of the proposed toolkit is the ability to incorporate hydrologically relevant spatial datasets at the applied, operational level to produce high quality functional products.