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<br />study days, soundings were launched every 3 hours; however, on most days <br /> <br />soundings were launched in the morning between 1200 and 1500 G.m.t. and in <br />the early afternoon between 1800 and 2000 G.m.t. at sites shown in figure 1. <br /> <br />Table 1. - Rawinsonde sample sizes <br /> <br /> Tot a 1 <br />Location 1975 1976 1977 sample <br />Miles City, Montana (MLS)* 251 160 148 559 <br />Billings, Montana (BIL) 91 91 <br />Baker, Montana (BA) 78 78 <br />Glendive, MOntana (GD)* 231 231 <br />Plevna, Montana (PL)* 232 232 <br />Goodland, Kansas (GLD) 47 158 202 407 <br />Limon, Colorado (LIC) 122 122 <br />South Park, Colorado (SPK) 112 112. <br />Big Spring, Texas (BGS) 57 157 162 376 <br />Midland, Texas (MAF) 193 229 422 <br />TOTAL 1011 782 837 2630 <br /> <br />*1975 meso net stations. <br /> <br />In 1975, special mesonet observations from three sites located on a <br /> <br />triangular grid of nearly 85-km separation north and east of Miles City, <br /> <br />Montana, were analyzed. Days when the three soundings were launched <br /> <br />simultaneously were used in this study to examine the spatial variability <br /> <br />of thermodynamic controls of convection. Limited data sets were obtained <br /> <br />from August and September at Goodland on 47 days in 1975. Data from June <br /> <br />to September were collected at Big Spring on 57 days when convective <br /> <br />activity was expected. <br /> <br />In 1976, HIPLEX rawinsondes were also collected at Baker, Montana, located <br /> <br />about 75 km east of Miles City to determine significant variations east <br /> <br />4 <br />