This paper describes work performed by M.I.T. Lincoln Laboratory for the Federal Aviation Administration to investigate the use of expert system techniques for weather radar interpretation. The design of WX1, a prototype system for recognizing low-altitude wind shear hazards from Doppler weather radar data, is presented. The WX1 system consists of a rule-based expert system coupled to an object-oriented image processing package. Initial results for recognition of two types of low-altitude wind shear are provided.