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SVRGIS (Updated: 03 July 2018).
Overview

Welcome to the SVRGIS page for the SPC. This page has the United States severe report database (tornadoes 1950-2016, hail/wind 1955-2016), converted into shapefile (.shp) file format as well as a Geographic Information System (GIS) database. The data can be viewed in graphical, tabular, and statistical formats depending on end-user programs.

The NOAA/NWS Geodata page, has links that are directed to free, easy-to-use GIS viewing programs.

The data originate from the comma separated value (.csv) files available at:
http://www.spc.noaa.gov/wcm/#data

The column headings are the same as those described in this document:
http://www.spc.noaa.gov/wcm/data/SPC_severe_database_description.pdf

Location Codes for Storm data here.

Map of State FIPS Numbers here.

Text list of County FIPS Numbers here.

Previously, the data were prepared in a USA Contiguous Lambert Conformal Conic projection with North American Datum 1983. However, after numerous requests, beginning in 2018, the data are now provided latitude and longitude coordinates. The data are contained in zip files and can be quite large, up to around 55MB (i.e. Cities.zip).

Lastly, please see the new changelog for the latest information regarding changes to the data that goes into creating these GIS files.

If you have comments regarding this information, contact Bryan Smith or Patrick Marsh of the Storm Prediction Center.


CHANGE LOG: Read Here
  • 09 September 2018: Read the changelog file
  • 03 July 2018: Initial Release of the 2018 GIS files, including the 2017 severe reports. These files are in lon/lat coords rather than projected space.
  • 13 June 2017: Add updated .mxd file for 2017
  • 15 May 2017: Initial Release of the 2017 GIS files, including the 2016 severe reports
  • 14 March 2016: Add updated .mxd file for 2016
  • 10 March 2016: Initial Release of the 2016 GIS files, including the 2015 severe reports
  • 28 April 2015: Added changelog to website
  • 14 April 2015: Fixed issue with tornado/wind/hail GIS files stemming from corrupt CSV file used in generation of GIS files
  • 18 March 2015: Initial Release of the 2015 GIS files containing the 2014 severe reports

Tornadoes (1950-2017), Wind/Hail (1955-2017)
Preliminary SVRGIS 1950 - 2017 tornado image
Download Tornadoes:
Paths or Initial Points
Preliminary SVRGIS Hail 1955 - 2017 image
Download Hail:
Paths or Initial Points
Preliminary SVRGIS Wind 1955 - 2017 image
Download Wind:
Paths or Initial Points
Additional Images
Mobile Home Density
Download mobile_home_precentage_county.zip
Additional Information
Additional compressed files and information:
Instruction Manual NWS County Warning Areas Counties | Cities | States
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Page last modified: September 09, 2018
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