Abstract
The UK Meteorological Office maintains a 5 km spatial resolution archive of hourly and daily rainfall totals derived from integrations of the radar images obtained at 5 minute intervals from each radar in the UK network. The archive is named PARAGON (1). Since the radars are mostly separated by more than the ~75 km generally accepted as the effective range for quantitative use of radar data, the daily rainfall totals derived from radar are ‘adjusted’ using the daily totals from a synoptic raingauge network of average spacing -40 km. These ‘adjusted’ fields of daily rainfall are also archived. The archive also has the facility to ‘adjust’ the daily radar rainfall totals using data from the UK climatological network of daily raingauges (average spacing about 8 km). However in this study we use the climatological gauge values as the ‘truth’ with which to compare radar and ‘adjusted’ radar fields. Comparison maps can be produced for each radar of the network and areas of low sensitivity or noisy output identified. The effect of ‘adjustment’ on performance can be identified. Examples of these maps over a complete year are given and long term and seasonal variations of performance are also explored.
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