Historical Observing Metadata Repository

The Historical Observing Metadata Repository (HOMR) is NCDC's integrated station history database that provides in situ or land-based station metadata in support of NCDC research, reporting, data products, and web applications. HOMR tracks detailed information for a variety of weather stations throughout their lifespans, including identifiers, names, locations, observation times, reporting methods, photos, and equipment modifications and siting. Station histories are most extensive for the National Weather Service (NWS) Cooperative Observing Program, and they include officially documented station changes that adhere to an NWS approval process. Use the search below to access these historical station details.

Significant Change Report

The "SIG" report is a listing of all significant changes that have been processed at the NCDC Product Development Branch for the NWS Cooperative network. This report is produced each month. The information provided includes identifiers, publication information, effective date of the change, and a brief description of the change.

SIG, Standard Version