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<br />2. The average wind direction between the surfacle and 80 kPa is <br />from 250 to 0400 true (AWDO). . <br /> <br />3. A 3-kPa-thick stable layer must exist with its base between <br />o to -10 oc and its top temperature at least 1.5 oC higher than <br />the temperature extrapolated from the base of the layer to the top <br />using pseudoadiabatic ascent (DTCO). <br /> <br />4. A 10 oC dewpoint depression must exist somewhere within the <br />3-kPa layer of 3. above (DPDO). <br /> <br />C. Class B Cloud Criteria <br /> <br />1. Items A.1. through A.3., A.5., A.6., A.B., and A.9. above. <br /> <br />2. Cloud-top temperature lower than -6 oC but higher than -20 oC <br />(CTTO) . <br /> <br />3. No vertical velocity or buoyancy restrictions (VVLO and <br />BOYO) . <br /> <br />Table 5 summarizes all the key variables, the declaration criteria, <br />and the method of measurement for the Class A-I, A-2, and B clouds. <br /> <br />15 <br />