Climate & Health - Drought Severity

This indicator reports the population-weighted percentage of weeks in drought between January 1, 2012 and December 31, 2014.
Report Area Percentage of Weeks in D0 (Abnormally Dry) Percentage of Weeks in D1 (Moderate Drought) Percentage of Weeks in D2 (Severe Drought) Percentage of Weeks in D3 (Extreme Drought) Percentage of Weeks in D4 (Exceptional Drought) Percentage of Weeks in Drought (Any)
Franklin County, PA 9.53% 0% 0% 0% 0% 9.53%
Pennsylvania 13.5% 2.24% 0% 0% 0% 15.74%
United States 16.96% 12.59% 8.84% 4.92% 2.54% 45.85%
Note: This Indicator is compared with the state average. Green - Better than state average, Red - Worse than state average.
Data Source: US Drought Monitor. 2012-14. Source geography: County
Percentage of Weeks in Drought, 1st Quarter 2015
Report Area Percentage of Weeks in D0 (Abnormally Dry) Percentage of Weeks in D1 (Moderate Drought) Percentage of Weeks in D2 (Severe Drought) Percentage of Weeks in D3 (Extreme Drought) Percentage of Weeks in D4 (Exceptional Drought) Percentage of Weeks in Drought (Any)
Franklin County, PA 17.98% 0% 0% 0% 0% 17.98%
Pennsylvania 20.62% 0% 0% 0% 0% 20.62%
United States 13.03% 7.1% 2.47% 5.69% 7.42% 35.72%
Website Updated August 2016

Climate & Health - Drought Severity

Data Background

The U.S. Drought Monitor, established in 1999, is a weekly map of drought conditions that is produced jointly by the National Oceanic and Atmospheric Administration, the U.S. Department of Agriculture, and the National Drought Mitigation Center (NDMC) at the University of Nebraska-Lincoln. The U.S. Drought Monitor website is hosted and maintained by the NDMC. The map is based on measurements of climatic, hydrologic and soil conditions as well as reported impacts and observations from more than 350 contributors around the country. The U.S. Drought Monitor, a composite index that includes many indicators, is the drought map that policymakers and media use in discussions of drought and in allocating drought relief. For more about this source, please visit the United States Drought Monitor web page.

Methodology

This indicator reports the percentage of weeks in drought, by drought severity level. Data is based on analysis of weekly Drought Monitor shapefiles for 2012, 2013, and 2014. This weekly analysis reports the area of the United States experiencing drought, by drought severity level (D0 - Abnormally Dry through D4 - Exceptional Drought).

156 weeks of data presented in this format were analyzed by CARES to generate the 3-year average drought statistics shown here. Analysis involved intersecting census block group centroids with each of the weekly US Drought Monitor shapefiles. Resulting figures show the percentage of weeks that the report areas experience drought. Report area figures are population-weighted based on the following formula:

Percentage = [ SUM( Number of Weeks at Dx * P ) / SUM(Total Weeks * P) ] * 100

Where Dx is the drought severity level and P is the population of each census block group

For more information about the original data used in this calculation, please see the US Drought Monitor US Drought Monitor GIS Data Archive web page.

Courtesy: Community Commons, <www.communitycommons.org>, August 2016