National Hydrologic Outlook Soil Moisture

Palmer Drought Severity Index	Developed to measure long-term (months) soil moisture variations
Crop Moisture Index	Monitors shorter-term (days) soil moisture variations (top 5 feet)
Soil Moisture Monitoring and Prediction	Experimental project conducted by the NWS National Centers for Environmental Prediction (NCEP) Climate Prediction Center
Soil Moisture and Outlook for U.S.	Center for Ocean-Land-Atmosphere Studies initial model  conditions and predicted 14-day change in soil moisture
Keetch-Byram Drought Index	Used by the U.S. Dept. of Agriculture to monitor wildfire conditions

Please note: Soil moisture indices may be misleading in winter because they may not adequately
account for frozen precipitation, snow on the ground or frozen ground.