Utilize the input text as a context reference, choose the right relationship between NEXRAD and National Weather Service from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

The Medford National Weather Service NEXRAD went live in April 1996.

Answer: operator