1. A wind shear detection system comprising: antenna means for mounting on an aircraft; antenna driver means, connected to said antenna means, for driving said antenna means to scan in elevation and azimuth along the aircraft flight path; transceiver means, connected to said antenna means, for generating a transmitted signal and for receiving reflected data; base data processor means, connected to said transceiver means, for processing the reflected data and providing atmospheric measurement data for individual resolution cells that can be formed into a 3-D grid of atmospheric data samples; base data filter means, connected to said base data processor means, for removing receiver noise from said atmospheric measurement data and providing filtered atmospheric measurement data; volumetric feature extraction means connected to said base data filter means, for identifying a plurality of features within the 3-D grid of the filtered atmospheric measurement data and grouping said atmospheric data samples having a first feature into first air masses of interest and grouping said atmospheric data samples having a second feature into second air masses of interest; spatial feature association and filtering means, connected to said volumetric feature extraction means, for combining said first air masses of interest with said second air masses of interest to provide a 3-D representation of atmospheric conditions; and contextual matching means for comparing said 3-D representation of atmospheric conditions to a known wind shear atmospheric conditions model and providing an output signal when a wind shear threshold condition is exceeded.