The COST-717 Action has a working group (No 3) on 'Using Radar Information
for Assimilation into Atmospheric Models'. As an initial part of its plan,
the group is reviewing previous attempts to assimilate radar data. The main
techniques used to assimilate precipitation data - physical initialization
, latent heat nudging and variational assimilation are described. Most prev
ious studies have worked with surface rain rate estimates, but attempts to
assimilate reflectivity directly are also covered. (C) 2000 Elsevier Scienc
e Ltd. All rights reserved.