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Moisture Surplus and Deficit Maps

Moisture Surplus and Deficit MapThe Moisture Surplus and Deficit maps represent the departure from typical moisture conditions over a 1-, 3-, and 5-year time period (Koch 2011). PRISM climate grids (4km resolution) were used to calculate a moisture index value for each location across the contiguous U.S. (CONUS), with the final product resampled to 1km resolution. Moisture index values incorporate both precipitation and potential evapotranspiration, giving an accounting of a location's water balance. Typical (i.e., long-term) moisture conditions are represented by the 100 year average and standard deviation. Moisture conditions over a 1-, 3-, or 5-year window are compared to the corresponding 100 year conditions to classify an area as having moisture deficit, surplus, or near normal conditions during the time period of interest.

Moisture Surplus and Deficit Maps
Conterminous US Preview PDF
One Year Average Picture Preview 636 KB Adobe Acrobat Reader PDF file 1.6 MB
Three Year Average Picture Preview 723 KB Adobe Acrobat Reader PDF file 1.8 MB
Five Year Average Picture Preview 767 KB Adobe Acrobat Reader PDF file 2 MB


Moisture Surplus and Deficit Maps Information:
FHM National Technical Report: Recent Drought Conditions in the Conterminous United States (3.3 MB PDF)


Frank H. Koch
Research Ecologist

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