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Combined Clear-air Radar And Sodar Observations Of Mesoscale And Microscale Structures Ina Cold Front

This study combines observations from remote sensing instruments and a surface mesonetwork to examine important mesoscale and microscale features associated with a cold front. Sodar observations of the front reveal its similarity to a gust front and contain evidence of Kelvin-Helmholtz billow formation and of a possible solitary wave ahead of the front. Clear-air radar observations of vertical velocity from 1.2-10 km AGL indicate that gravity waves forced by the front do not propagate above 3.5 km, while a temperature sounding suggests that the vertical wave propagation is limited by a neutral layer from 3.2-4.0 km. The observed gravity wave frequencies are found to be dominated by buoyancy oscillations both above the front and in the cold air behind it.