A study is made of the surface micro-features of a depression-type pressure wave that passed across the Cloud Physics network in southwestern Ohio, April 7, 1948. Pressure change, wind, rain, temperature, and humidity observations in the network are described with the aid of isochrone charts and micro-synoptic charts at 5-minute intervals. Comparison of the micro-charts with a section of the conventional surface weather map suggests a possible linkage between the depression-type wave and a squall line or pressure jump line.