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<br />APRIL 1990 <br /> <br />DESHLER, REYNOLDS AND HUGGINS <br /> <br />293 <br /> <br /> <br />TIME (UTe) 06 <br /> <br />03 <br /> <br />00 <br /> <br />21 <br /> <br />18 <br /> <br />15 <br /> <br />FIG. 2. Time-height cross section from SHR soundings. The dotted lines are relative <br />humidity contours, the dashed lines temperature, the solid lines equivalent potential <br />temperature, and the heavy solid lines frontal boundaries, <br /> <br />cloud physics aircraft provided microphysical infor- <br />mation on the natural precipitation processes occur- <br />ring. Combining this with the 1800 SHR sounding and <br /> <br />radar RHIs a conceptual picture of the cloud structure <br />was prepared, Fig. 3. Characteristic features were fall <br />streaks associated with dendritic crystals falling from <br /> <br />6 <br /> <br />18 DEC 1986 <br /> <br />1700 UTC <br /> <br />4 <br /> <br />~ <br />\\~ I <br />-Iooe \ \ \." ': -' ~; <br />\ \ \ \,' .. ,'} <br />...--y-~ <br /> <br />,) <br /> <br />dBZ <br />[] 0-9 <br />11110-14 <br />(] 15-19 <br />. ~20 <br /> <br />5 <br /> <br />E <br />-'" <br /> <br />, ' <br />~ f. .. i; .,.' <br />J..t 1'..:10._. <br />i . ..!~ l <br />,....,/ . .. <br />, .' '\ J''''\-~ <br />;/: i PI': \ <br />-" ! C)= 't~ <br />2 ooe~ .;t/-. "::-. f' '.:'\\ <br />~.. ,.......,. <br /> <br />\ ,'..: ., <br />(~.:. ~~:':'~~-'- - ;- <br />;'''{.f '_'~:"-' <br />~-"'./ <br /> <br />.. <br />., <br /> <br /> <br />I- 3 _5oe <br /> <br />:c <br />(9 <br />w <br />:c <br /> <br /> <br />10 <br /> <br />20 <br /> <br />30 <br /> <br />40 <br /> <br />50 <br /> <br />60 <br /> <br />70 <br /> <br />80 <br /> <br />90 <br /> <br />100 110 <br /> <br />120 130 140 <br /> <br />DISTANCE FROM SHERIDAN RADAR lkm) <br /> <br />FIG. 3. Cross section of the clouds over the barrier showing echo and temperature structure. <br />Microphysical characteristics of the cloud at the locations of the letters are given in Table 1. <br />