This paper is a legal policy and comparative study regarding Korean Meteorology Act and the relationship between the private weather industry and the governmental weather service through the experience of the United States. The private weather industry that provides for-profit weather forecasting services has developed since 1960's, and has grown rapidly with development of telecommunication technology. Korean government also promotes those industries through establishment of new laws and regulations that encourage research and development in the weather forecasting technology and weather information trade. The relationship between the private weather industry and the governmental weather service is not only cooperation one but also competitive one, because the private weather industry gets the basic information from the government and develops the information as value-added information for customers. In terms of policy matters, it is necessary to have adequate partnership between the private weather industry and the governmental weather service. The U.S experience would be good example to study for develop the policy. This paper explores the U.S. administrative and the legal systems regarding weather service in the U.S., and cooperation policy between the private weather industry and the governmental weather service in the U.S. In conclusion, it is necessary to consider the change the definition of Meteorology into environmental information in order to make scope of Weather Service jurisdiction. In terms of economic development, it is also required to promote the private weather industry. However, it should not be restricted the basic role of the national weather service providing basic public service. It might be necessary for government to consult in good faith with the private weather industry transparently.