. Compendium of meteorology. Meteorology. 1288 RADIOMETEOROLOGY tals arriving at the ground at low temperatures and large snowflakes near the freezing point. The ideas of Ryde, and of Austin and Bemis, on the coalescence of crystals from the — 4C level to below the bright band are corroborated; Ryde's ratio of 40 to 1 between —4 and OC is not indicated by Browne's observations. More observations similar to those by Browne for various cloud depths and precipitation intensities are desirable for a more detailed study of precipitation growth by diffusion and coalescence. Horizontal Structure of P
. Compendium of meteorology. Meteorology. 1288 RADIOMETEOROLOGY tals arriving at the ground at low temperatures and large snowflakes near the freezing point. The ideas of Ryde, and of Austin and Bemis, on the coalescence of crystals from the — 4C level to below the bright band are corroborated; Ryde's ratio of 40 to 1 between —4 and OC is not indicated by Browne's observations. More observations similar to those by Browne for various cloud depths and precipitation intensities are desirable for a more detailed study of precipitation growth by diffusion and coalescence. Horizontal Structure of Precipitation On the PPI scope^ of the radar, continuous precipita- tion appears as an extensive brightened area. Generally teras at 1230 EST and was moving eastward at about 30 mph. At the 700-mb level a closed cyclonic center was located over southern Ohio, and south-southwest winds of about 20 mph prevailed over the New Jersey area. At 1350 EST showers appeared to be scattered almost at random out to a radius of 125 miles from the station. The remainder of the afternoon saw the virtual decay of the storms in the northern sector and a build- up of the storms to the south. At 1515 EST, what had previously been a loose coalescence of cells was a con- tinuous pattern about 30-50 miles wide but narrowing in its central portion to about 10 miles and trailing off to a thin line at its most distant point, 180 miles distant at 160° azimuth. Farther south a strange pattern in the. Fig. 4.—Precipitation patterns observed from Belmar, N. J., March 10, 1949. Circular range markers are at 25-mile inter- vals. {Courtesy Signal Corps Engineering Laboratories.) there are indications of definite edges to the storm, although in winter the precipitation may extend in all directions from the station out to the limit of the range of observation of the radar. An extensive area of warm- front precipitation is often seen to have an abrupt line of cessation. In showery activity the precipitatio
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