Climate of May 2011

U.S. Drought Indicators

National Climatic Data Center, 14 June 2011

The data presented in this drought report are preliminary. Ranks, anomalies, and percent areas may change as more complete data are received and processed.

Several climate indicators are used to monitor drought in the United States. These indicators include:


Palmer-based Indicators

Map showing the Palmer Z Index Map showing the Palmer Hydrological Drought Index

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Standardized Precipitation Index

Map showing Standardized Precipitation Index Map showing Standardized Precipitation Index
Map showing Standardized Precipitation Index Map showing Standardized Precipitation Index

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Maps showing the long-term percent-of-normal precipitation

Map showing Percent of Normal Precipitation for last 48 months Map showing Percent of Normal Precipitation for last 60 months

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Maps showing percent-of-normal precipitation for airport stations

Map showing Percent of Normal Precipitation for current month Map showing Percent of Normal Precipitation for last 3 months

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Statewide Precipitation Ranks
Map showing Statewide Precipitation Ranks Map showing Statewide Precipitation Ranks
Map showing Statewide Precipitation Ranks Map showing Statewide Precipitation Ranks

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Maps Provided by the NOAA Regional Climate Centers (HPRCC)
Map showing 24-Month Percent of Normal Precipitation Map showing 36-Month Percent of Normal Precipitation

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SNOTEL stations in western Mountains (from the Western Regional Climate Center) Map showing WRCC SNOTEL station percent of average precipitation - color coded Map showing WRCC SNOTEL station percent of average precipitation - numeric values
Map showing USDA-WCC SNOTEL station percent of average snow water equivalent - color coded Map showing USDA-WCC SNOTEL station percent of average snow water equivalent - numeric values

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Mountain Snowpack
Map showing Mountain Snowpack

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Vegetation Health Index Map showing VegDRI - Vegetation Drought Response Index

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National Weather Service Soil Moisture Models Map showing NWS modeled soil moisture anomalies Map showing NWS modeled runoff anomalies

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National Weather Service Leaky Bucket Model
Map showing North America Leaky Bucket Model Soil Moisture Percentiles
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Topsoil Moisture
(observed by the USDA and mapped by the Climate Prediction Center) Map showing current month USDA-CPC soil moisture short to very short Map showing USDA-CPC soil moisture short to very short, current month compared to 10-year mean

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Pasture and Range Land Condition
(observed by the USDA and mapped by the Climate Prediction Center) Map showing current month USDA-CPC poor to very poor pasture and range land Map showing USDA-CPC poor to very poor pasture and range land, current month compared to long-term mean

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U.S. Geological Survey Streamflow Map showing USGS Monthly Mean Streamflow Map showing USGS Monthly Mean Streamflow

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Contacts & Questions
For additional, or more localized, drought information, please visit:
For further information about this web page, please contact:
Climate Services and Monitoring Division
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: +1-828-271-4876
phone: +1-828-271-4800
email: ncdc.info@noaa.gov
To request climate data, please E-mail: ncdc.orders@noaa.gov

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