Local storm report

A local storm report (LSR) is transmitted by the National Weather Service of what it receives from storm spotters such as amateur radio operators, storm chasers, law enforcement, civil defense (now emergency management), firefighters, EMTs, or citizens about severe weather conditions in their area. Those reports go to the local National Weather Service office and can be used to issue severe thunderstorm warnings, tornado warnings, and other weather warnings/bulletins, in addition to the LSR.

The Storm Prediction Center, working with the NWS, collects the reports for its own database, and also works with the National Climatic Data Center, which eventually stores the reports in the official record, Storm Data.