This collection contains data from the Natural Environment Research Council (NERC) Mesosphere-Stratosphere-Troposphere (MST) Radar Facility at Capel Dewi, near Aberystwyth in West Wales.

The principal measurements made by the MST radar, a 46.5 MHz pulsed Doppler radar), ideally suited for studied of atmospheric winds, waves and turbulence. It is run predominantly in the ST mode (approximately 2 - 20 km altitude) for which MST radars are unique in their ability to give continuous measurements of the three dimensional wind vector at high resolution (typically 2 - 3 minutes in time and 300 m in altitude). Under certain circumstances they can additionally provide information about humidity, static stability (thus allowing monitoring of the altitude and sharpness of the tropopause) and turbulence of at least moderate intensity. Surface meteorological measurements from the radar site, ceilometer data, sky camera images and wind speed and direction recorded from a 10m tower located at Frongoch (6km away) are also available. Other instruments at the facility have included one of the Met Office's boundary layer wind profilers and, on occasion, the NCAS's boundary layer wind profiler.

The collection also includes high-resolution radiosonde data from RAF Aberporth, approximately 45 km to the south-west of the radar site, are available for the period April 1990 - June 2000 and data from the RAL Cloud Radar. Facility data are available to all registered users under the UK Open Government License; Met Office data are available under the NERC-Met Office agreement and the RAL Cloud Radar is restricted to registered users at present.