The official opening of the Chenies (London) radar station in January 1985, introduced the United Kingdom's Weather Radar Network to the general public for the first time. Radar imagery has already been in operational use within the Meteorological Office for some years, and may eventually play an important part in the Office's weather forecast presentations on television. Invaluable though it may be to the weather forecaster, however, weather radar is only one example of the major advances being made in contemporary weather forecast technology. In particular, the frequent availability of satellite imagery from such sources as METEOSAT 2 and satellites of the NOAA series (popularized recently through frequent use during weather forecast presentations on both national and local television), the generation of mesoscale ('national') forecasts using enhanced computer-based predictive systems, and advances in data transmission, constitute a formidable array of predictive tools now available to the forecaster. More importantly, the operational use of radar allows the forecaster to benefit from the provision of precipitation data in 'real time'; that is, data concerning weather conditions are transmitted to the forecaster as soon as they are generated.Weather radar is also a valuable data source for climatological research. For example, Browning (1983) presented a mesoscale analysis of the snowstorms of 8-9 January 1982, using data from the weather radar network, METEOSAT 2, and the Meteorological Office's ground stations. An historic analysis of this kind increases our understanding of weather at the mesoscale and, also, gives an indication of the weather conditions likely to be experienced should such conditions be repeated in the future. Hill et al. (1981) used a three-dimensionally scanning radar in south Wales to clarify the mechanism involved with the orographic enhancement of precipitation. As well as demonstrating the relationship between enhancement and low-level wind speed, they were also able to test a theoretical model for the washout of small water droplets in seeder clouds by larger raindrops originating from high-level feeder clouds. This research, for example, may assist the forecast of orographically-enhanced precipitation over south Wales in the future.The state of weather forecast technology is now such that a new word, 'nowcasting', has entered the weather vocabulary. Nowcasting is the prediction of weather over the period 0-6 hours ahead. The most recent manifestation of nowcast at RYERSON UNIV on June 17, 2015 ppg.sagepub.com Downloaded from