This page allows you to generate a GIS shapefile of NWS issued Local Storm Reports for a time period of your choice. Please be sure to read the archive status and dbf schema below. The IEM's archive is certainly not complete or official. If you are looking for a real-time source of lsr shapefiles, you can find that here.
VALID Timestamp of LSR in GMT/UTC time MAG Magnitude value of the LSR WFO Weather Forecast Office originating the LSR TYPECODE 1 character identifier of the report type TYPETEXT Textual value of LSR type used in report CITY Location used for the LSR COUNTY County/Parish of the LSR city SOURCE Who reported the LSR REMARK Text summary with the LSR