Before the radar return is presented to the network, much post processing of the signal from each site is required. Other checks, corrections etc., are performed. These checks and adjustments are mostly transparent to the end-user. It goes without saying also that it assumes that the mesoscale models have a correct representation of the humidity and temperature characteristics in the area under consideration. In practice, despite correction using model data, rainfall intensity at the 'edges' of the network coverage can be overestimated, particularly for precipitation approaching from ocean areas.
Due allowance appears to be made on the public radar site for anomalous propagation.
Be aware though that in extreme cases, even the filtering applied may allow some anomalous echoes through. Snowflakes grow rapidly as cloud temperatures rise towards 0 deg C, but this level may be below the radar beam. Note also that the radar beam, depending upon the elevation of the radar scanner head, and the range from the radar site, may not intercept all the light rain or drizzle in the 'footprint' of the signal - it may pass above the falling precipitation. Meteorological considerations C1. Extrapolation should be used with extreme caution.