From AMS Glossary
That branch of meteorology embracing the propagation of radio waves in the atmosphere and the use of such waves for the remote sensing of clouds, storms, precipitation, turbulence, winds, and various physical properties of the atmosphere.
Radio meteorology encompasses radar meteorology.
Bean, B. R., and E. J. Dutton 1996. Radio Meteorology. National Bureau of Standards Monograph No. 92, U.S. Government Printing Office, . 435 pp.