System and method for dynamically transmitting network alert system (NAS) information from television network to stations using information embedded in an HDTV signal

A system for dynamically transmitting network alert system (NAS) information from a television network to an affiliate station using information embedded in an HDTV signal, comprising:

• a program data server configured to provide network alert system (NAS) data;
• a network video programming source configured to provide network video programming;
• a data inserter configured to insert the NAS data into video line 12, data ID (DID) 0x53, secondary data ID (SDID) 0x01of vertical ancillary (VANC) space of a high definition television (HDTV) signal to develop a combined network video programming and NAS data signal, the data inserter comprising a data formatter configured to format the NAS data and a multiplexer configured to combine the network video programming and NAS data;
• and
• a transmission facility configured to transmit the combined network video programming and NAS data signal.