Hydrology 15 : The scientific study of precipitation, evaporation, distribution, and effects of water on the Earth's surface, in the soil and rocks, and in the atmosphere
NOAA/National Weather Service NOAA Center for Weather and Climate Prediction, Climate Prediction Center, Climate Glossary, University Research Court,College Park, Maryland, USA 2004. http://www.cpc.ncep.noaa.gov/products/outreach/glo ssary.shtml, (Wthr - Amer) {862}