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<br />A. Class A-1 Cloud Criteria <br /> <br />1. Average liquid water content greater than 0.5 g/m3 ove~ <br />approximately a 1-km-long cloud region determined by 10 seconds <br />of flight at approximately 100 mls (AWCO). : <br /> <br />2. Average ice-crystal concentration* less than 1.0 per liter in <br />the 1-km-long (10 seconds of flight) cloud region of maximum <br />average liquid water content (AICO). <br /> <br />3. Maximum ice-crystal concentration* less than 5.0 per liter for <br />any 1-km-long (10 seconds of flight) cloud region (defined by FSSP <br />liquid water content greater than 0.01 g/m3) during the test <br />pass (MICO). <br /> <br />4. Vertical velocity greater than -1.0 mls in the region defined <br />by item 1., but if the vertical velocity is greater than 10.0 mls <br />and the buoyancy is greater than 1 oC, reject the candidate (VVLO <br />and BOYD). <br /> <br />5. Length of the test penetration less than 8 km as defined by an <br />FSSP liquid water content greater than 0.01 g/m3 (LPNO). <br /> <br />6. No radar echo detectable on the King Air weather radar. (RFLO). <br /> <br />7. Cloud-top temperature lower than -6 oC but higher than -12 oC <br />( CTTO) . <br /> <br />8. Cloud-base temperature higher than 0 oC (CBTO). <br /> <br />9. Minimum separation between the current test cloud and previous <br />test clouds greater than 15 km to insure the meteorological <br />independence of the clouds (DBCO). <br /> <br />B. Class A-2 Cloud Criteria <br /> <br />1. Items A.1. to A. 9. above. <br /> <br />s. <br /> <br />* Measured by the 2D-C depolarization signal, not the regular 2D-C <br />signal. Although the former signal is believed to indicate only <br />about 25 percent of the actual ice-crystal concentration, itis used <br />because the latter signal includes artifacts that cannot be rejected <br />in real time with the present system. <br /> <br />14 <br />