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Service Description: The National Forest Climate Change Maps project provides information on projected climate changes at a scale relevant to decision-making process, including forest plans to meet the needs of national forest managers. The maps use the best available science and are available for every national forest with relevant data coverage. The datasets include variables related to precipitation and air temperature, for both historical data and future projections. These datasets were created using 20-model averages of downscaled climate data from MACA-v2METDATA (https://climate.northwestknowledge.net/MACA/). For more information about this project, see https://www.fs.fed.us/rm/boise/AWAE/projects/national-forest-climate-change-maps.html. This dataset represents the absolute change between the historical (1975-2005) and future (2071-2090, RCP 8.5) values of the following metric for the contiguous United States: once-in-a-decade drought, as measured by the number of consecutive days without wetting rain in a summer (May-Sept). This was found by counting the number of days in the longest stretch of consecutive dry days in a summer, repeating this for each year, then calculating the 90th percentile value from this series.

Map Name: WO_OSC_DryDays10YrDrought_01

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• 10-Year Drought (Consecutive Summer Dry Days) (0)
  • Percent Change (1)
  • Absolute Change (2)
  • Future (RCP 8.5 2071-2090) (3)
  • Historical (1985-2004) (4)

Description: The National Forest Climate Change Maps project provides information on projected climate changes at a scale relevant to decision-making process, including forest plans to meet the needs of national forest managers. The maps use the best available science and are available for every national forest with relevant data coverage. The datasets include variables related to precipitation and air temperature, for both historical data and future projections. These datasets were created using 20-model averages of downscaled climate data from MACA-v2METDATA (https://climate.northwestknowledge.net/MACA/). For more information about this project, see https://www.fs.fed.us/rm/boise/AWAE/projects/national-forest-climate-change-maps.html. This dataset represents the absolute change between the historical (1975-2005) and future (2071-2090, RCP 8.5) values of the following metric for the contiguous United States: once-in-a-decade drought, as measured by the number of consecutive days without wetting rain in a summer (May-Sept). This was found by counting the number of days in the longest stretch of consecutive dry days in a summer, repeating this for each year, then calculating the 90th percentile value from this series.

Copyright Text: The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.

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Spatial Reference: PROJCS["NAD_1983_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-96.0],PARAMETER["Standard_Parallel_1",29.5],PARAMETER["Standard_Parallel_2",45.5],PARAMETER["Latitude_Of_Origin",23.0],UNIT["Meter",1.0]]

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Spatial Reference: PROJCS["NAD_1983_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-96.0],PARAMETER["Standard_Parallel_1",29.5],PARAMETER["Standard_Parallel_2",45.5],PARAMETER["Latitude_Of_Origin",23.0],UNIT["Meter",1.0]]

Units: esriMeters

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info:

Title: 10-Year Drought (Consecutive Summer Dry Days)
Author:
Comments: Greatest number of consecutive summer (May-Sept) dry days (<1/10 inch of rain) was calculated for each year over the historical (1985-2004) and future (RCP 8.5 2071-2090) time periods; absolute and percent change between these was then calculated. This includes three versions: one based on the 20-year average of summer maxima, one based on the overall maximum, and one based on the 90th percentile value of 20-year maxima.
Subject: 10-Year drought, based on 90th percentile from set of annual maximum number of consecutive summer dry days
Category:
Keywords: USDA Forest Service,USFS,Office of Sustainability and Climate,OSC,climate,climate change,drought,precipitation,summer,dry days
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