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Drought and Moisture Surplus for the Conterminous United States, Annual Data 5-Year Windows (Image Service)

Metadata Updated: October 31, 2023

Note: To download this raster dataset, go to ArcGIS Open Data Set and click the download button, and under additional resources select raster download option; the data can also be downloaded directly from the FSGeodata Clearinghouse. To summarize this dataset by U.S. Forest Service Lands, see the Drought Summary Tool. You can also explore cumulative drought and moisture changes from this StoryMap; additional drought products from the Office of Sustainability and Climate are available in our Climate Gallery and the OSC Drought page.The Moisture Deficit and Surplus map uses moisture difference z-score datasets developed by scientists Frank Koch, John Coulston, and William Smith of the Forest Service Southern Research Station. A z-score is a statistical method for assessing how different a value is from the mean (average). Mean moisture values were derived from historical data on precipitation and potential evapotranspiration, from 1900 to 2022. The greater the z-value, the larger the departure from average conditions, indicating larger moisture deficits or surpluses. Thus, the dark red areas on this map indicate a five-year period with extremely dry conditions, relative to the average conditions over the past century. For further reading on the methodology used to build these maps, see the publication here:

Access & Use Information

Public: This dataset is intended for public access and use. License: Creative Commons Attribution

Downloads & Resources


Metadata Created Date November 3, 2022
Metadata Updated Date October 31, 2023

Metadata Source

Harvested from USDA JSON

Additional Metadata

Resource Type Dataset
Metadata Created Date November 3, 2022
Metadata Updated Date October 31, 2023
Publisher U.S. Forest Service
Data First Published 2019-10-17
Data Last Modified 2023-10-06
Category geospatial
Public Access Level public
Bureau Code 005:96
Metadata Context
Schema Version
Catalog Describedby
Harvest Object Id c3139834-ee81-4491-bff6-0b368a1c0c4d
Harvest Source Id d3fafa34-0cb9-48f1-ab1d-5b5fdc783806
Harvest Source Title USDA JSON
Homepage URL
Metadata Type geospatial
Old Spatial -125.0208,24.0698,-66.4792,49.9375
Program Code 005:059
Source Datajson Identifier True
Source Hash 6cea8521de63909209a3337eaa89c466f8228dbd1eec28780f48a8c5cc5c15bf
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -125.0208, 24.0698, -125.0208, 49.9375, -66.4792, 49.9375, -66.4792, 24.0698, -125.0208, 24.0698}

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