A detailed and unique multisensor observation of an undular bore is presented. The data include those from rawinsonde, satellite, two Doppler radars, and a tall instrumented tower. Noteworthy are Doppler radar images that resolve the wave's characteristics and capture a good part of its spatial extent. The basic parameters of the wave train are established from the observations.

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*Department of Aerospace Engineering, Indian Institute of Science, Bangalore-560, 012, India

**National Severe Storms Laboratory, 1313 Halley Circle, Norman, OK 73069.