[1][2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.
Prior to the NWS reorganization in the 1990s, each state and territory had its own forecast office — with the exception of northern and southern California; north, south, and west Texas; and upper and lower New England.
Local offices (NWSOs) then each maintained their own county warning area, and the official hourly and daily readings at the weather station where they were located, typically at a regional airport in a smaller city.
[4] During the reorganization, many of these became forecast offices, while most were closed in favor of cheaper automatic weather stations like AWOS and ASOS.
[5] An interactive map of all six regions with links to individual WFOs can be found here: https://www.weather.gov/srh/nwsoffices