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By Location | County

County Location Page: Data & Maps

Data Source Summary

 

Below are all data sources used on the county-level location pages. Have questions about the data, maps, or statistics on Drought.gov? Email us at drought.portal@noaa.gov.

Data Source Type

Statistics: Drought Numbers by County

Data Sources
Source Name

Population in Drought

Data Source Update Frequency/Last Updated
Updates Weekly
Data Source Description

Sources: U.S. Drought Monitor

Data was ingested by the U.S. Drought Monitor web API and stored in a database on the web server.

Source Name

Drought Rankings

Data Source Update Frequency/Last Updated
Updates Monthly
Data Source Description

Sources: NOAA National Centers for Environmental Information

County rank data were ingested from NOAA's National Centers for Environmental Information (NCEI) and joined with spatial data for mapping purposes.

Data Source Type

Current Conditions

Data Sources
Source Name

U.S. Drought Monitor

Data Source Update Frequency/Last Updated
Updates Weekly
Data Source Description

Sources: NDMCNOAAUSDA

U.S. Drought Monitor data from the National Drought Mitigation Center (NDMC) were available in a GIS format.

Source Name

Temperature: 30-Day Departure from Normal

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Sources: UC MercedClimate Engine

The 30-day departure from normal temperature map shows the difference of the last 30 days from the usual conditions for the same time period averaged since 1980. This map uses the gridMET and PRISM temperature datasets, which are delayed from the current day by 2 to 3 days to allow for data collection and quality control. Temperature data from Climate Engine were available in raster format.

* Currently, data is only available for the contiguous U.S.
Source Name

Precipitation: 30-Day Percent of Normal

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Sources: UC MercedClimate Engine

The 30-day percent of normal precipitation map shows the difference of the last 30 days from the usual conditions for the same time period averaged since 1980. This map uses the gridMET and NLDAS precipitation datasets, which are delayed from the current day by 2 to 3 days to allow for data collection and quality control. Precipitation data from Climate Engine were available in raster format.

* Currently, data is only available for the contiguous U.S.
Data Source Type

Drought Indicator Blends

Data Sources
Source Name

Experimental Short-Term Drought Indicator Blend

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Sources: UC MercedClimate Engine

Drought blends data from Climate Engine were available in raster format. 

These experimental blends integrate several key drought monitoring products and indices into a single short-term or long-term product, based on the methodology developed at the NOAA Climate Prediction Center (CPC). The blends are created using the Climate Engine tool, and apply the CPC weighting ratios to the high-resolution gridMET gridded research dataset. The data is updated daily, with a delay of 2 to 3 days to allow for data collection and quality control.

The short-term blend combines PDSI, Z-Index, 1-month SPI, and 3-month SPI to estimate the overall short-term drought. 

This product is an example of current NIDIS-funded researchLearn more.

* Currently, data is only available for the contiguous U.S.
Source Name

Experimental Long-Term Drought Indicator Blend

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Sources: UC MercedClimate Engine

Drought blends data from Climate Engine were available in raster format. 

These experimental blends integrate several key drought monitoring products and indices into a single short-term or long-term product, based on the methodology developed at the NOAA Climate Prediction Center (CPC). The blends are created using the Climate Engine tool, and apply the CPC weighting ratios to the high-resolution gridMET gridded research dataset. The data is updated daily, with a delay of 2 to 3 days to allow for data collection and quality control.

The long-term blend combines PDSI, Z-Index, and 6-month, 1-year, 2-year, and 5-year SPI to estimate the overall long-term drought. 

This product is an example of current NIDIS-funded researchLearn more.

* Currently, data is only available for the contiguous U.S.
Data Source Type

Agriculture by County

Data Sources
Source Name

Crops and Livestock in Drought

Data Source Description

Sources: USDA National Agricultural Statistics Service, U.S. Drought Monitor

County-level commodities data was collected from USDA agricultural censuses. County figures for field crops represent the total acres harvested within that county. County figures for livestock represent the total inventory within that county. 

U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.

Source Name

Agricultural Statistics

Data Source Description

Source: USDA National Agricultural Statistics Service

GIS was used to aggregate the number of acres a crop was harvested in a county.

Data Source Type

Water Supply by County

Data Sources
Source Name

Daily Streamflow Conditions

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Source: U.S. Geological Survey

Streamflow data were available in a GIS format from the U.S. Geological Survey's WaterWatch.

U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.

Source Name

One-Month Precipitation Outlook

Data Source Update Frequency/Last Updated
Updates Monthly
Data Source Description

Source: Climate Prediction Center

Precipitation data from NOAA's Climate Prediction Center (CPC) were available in a GIS format.

U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.

Source Name

Water Supply Statistics: Streamflow % Below Normal

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Source: U.S. Geological Survey

Summary table information was ingested and parsed to provide statistics at the state level.

Source Name

Water Supply Statistics: Precipitation % Below Normal

Data Source Update Frequency/Last Updated
Updates Monthly
Data Source Description

Source: Climate Prediction Center

Temperature and precipitation data from NOAA's Climate Prediction Center were available in a GIS format for the United States. GIS was used to extract data by state to generate state-level statistics.

Data Source Type

Public Health by County

Data Sources
Source Name

Social Vulnerability Index (SVI)

Data Source Update Frequency/Last Updated
SVI Last Updated in 2018
Data Source Description

Sources: Centers for Disease Control and PreventionU.S. Drought Monitor

SVI data were available in a GIS format at the county level from the Centers for Disease Control and Prevention (CDC).

U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.

Source Name

National Weather Service Heat Warnings

Data Source Update Frequency/Last Updated
Updates Weekly
Data Source Description

Sources: National Weather Service, U.S. Drought Monitor

National Weather Service warnings were available in a GIS format. Data includes all NWS warnings. Heat related warnings (Excessive Heat Watches, Heat Advisories, and Excessive Heat Warnings) are extracted for the site.

U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.

Source Name

Public Health Statistics: Wildfire by County

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Source: National Wildfire Coordinating Group (NWCG)

Active wildfires were ingested from the data that feeds the NWCG InciWeb interactive page. GIS was used to identify whether or not a county contained an active fire.

Source Name

Public Health Statistics: Social Vulnerability Index Score

Data Source Update Frequency/Last Updated
SVI Last Updated in 2018
Data Source Description

Source: Centers for Disease Control and Prevention

SVI data were available in a GIS format at the county level from the CDC.

Source Name

Public Health Statistics: NWS Heat Warnings

Data Source Update Frequency/Last Updated
Updates Weekly
Data Source Description

Source: National Weather Service

National Weather Service (NWS) warnings were available in a GIS format. Data includes all NWS warnings. Heat-related warnings were extracted for the site, and GIS was used to identify whether a heat warning was issued for a county.

Source Name

Public Health Statistics: NWS Air Quality Warnings

Data Source Update Frequency/Last Updated
Updates Weekly
Data Source Description

Source: National Weather Service

National Weather Service (NWS) warnings were available in a GIS format. Data includes all NWS warnings. Air quality warnings were extracted for the site, and GIS was used to identify whether an air quality warning was issued for a county.

Data Source Type

Future Conditions

Data Sources
Source Name

Evaporative Demand Drought Index (EDDI) Subseasonal Forecast

Data Source Update Frequency/Last Updated
Updates Daily
Data Source Description

Source: UC Merced

EDDI subseasonal forecast data were from the University of Idaho's THREDDS server in raster format.

Source Name

CPC Monthly and Seasonal Drought Outlooks

Data Source Update Frequency/Last Updated
Updates Monthly
Data Source Description

Source: Climate Prediction Center

Monthly and Seasonal Drought Outlooks from NOAA's Climate Prediction Center (CPC) were available in a GIS format.

Data Source Type

Historical Conditions

Data Sources
Source Name

U.S. Drought Monitor (2000 - Present)

Data Source Update Frequency/Last Updated
Updates Weekly
Data Source Description

Sources: NDMCNOAAUSDA

U.S. Drought Monitor (USDM) data from the National Drought Mitigation Center were available in a GIS format.

Source Name

Standardized Precipitation Index (1895 - Present)

Data Source Update Frequency/Last Updated
Updates Monthly
Data Source Description

Source: NOAA National Centers for Environmental Information

Standardized Precipitation Index (SPI) data was generated using nClimGrid 5km precipitation data. Monthly gridded SPI data was fitted into the U.S. Drought Monitor drought percentile categories. Categories were accumulated to provide statistical information at the CONUS, state, and county scales.

* Currently, data is only available for the contiguous U.S.
Source Name

Paleoclimate Data (0 - 2017)

Data Source Update Frequency/Last Updated
Yearly Data (Last Updated 2017)
Data Source Description

Source: NOAA National Centers for Environmental Information

Annual gridded paleoclimate Palmer Modified Drought Index (PMDI) data was fitted into the U.S. Drought Monitor drought percentile categories. Categories were accumulated to provide statistical information at the CONUS, state, and county scales.

* Currently, data is only available for the contiguous U.S.