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<br />7 <br /> <br /> N2 Ns <br />~tl L LWZn + ~t L LWSn <br />"=1 n I: , (1 ) <br /> LW = <br />" <br /> NZ ~t2 + NS ~ts <br /> <br />where <br /> <br />tv is the av~rage ~ntegrated liquid during the period <br /> <br />Atz = <br />Ats = <br />LWZ <br />LWS = <br /> <br />60 s, the averaging time for one liquid measurement in the zenith mode <br /> <br />S s, the averaging time for one liquid measurement in scan mode <br /> <br />= a single measurement of liquid i.n the zenith sampling mode <br /> <br />a single measurement of liquid in the scan sampling mode, <br />normalized to the' vertical component <br /> <br />it <br /> <br />NZ = total number of measurements in the zenith mode <br /> <br />NS = total number of measurements in scan mode <br /> <br />; <br /> <br />This value of liquid water was then used in the following equation <br /> <br />to determine the volume, V, of supercooled water passing over the <br /> <br />mountain in time interval, At: <br /> <br />V = LW U700 Y At <br /> <br />(2) <br /> <br />where <br /> <br />u,oo is the cross-barrier wind speed at 700 mb, and Y is the length <br /> <br />along the mountain where a seeding effect i~ presumed to occur, assumed <br /> <br />-"...'.""-........,..,.~"'...~"" <br /> <br />-,~.........,-~..__....."~-,-"..,,''",".''',',..,... <br /> <br />to be SO km (the nort~:~C)lJth extent Of ,the terrain above 8000le~tJ. <br /> <br />~ <br /> <br />If LW is in rom, u700 in mIs, Y = 5 x 104 m and At = 1.08 x 104 S, the <br />equation to retrieve V in acre-feet is <br /> <br />V (acre-feet) = 437.8 x LW x U700 <br /> <br />(3) <br /> <br />i: <br /> <br />~:_, A_I <br />