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Table 2.1-9. Classification of atmospheric statility* <br />• Documented and used by Stearns-Roger and Environmental Research and Technology <br />for [he Craig Generating Station meteorological studies. (1) <br />Stability Class Number Temperature Differance (°C/IOOm) <br /> <br />Extremely Unstable 1 <-2.0 <br />Unstable 2 >-2.0, but <1.0 <br />Slightly Unstable 3 >-I.O, but <-0.5 <br />Neutral 4 >-0.5, but <-0.1 <br />Stable 5 >-0.1, but <+2.0 <br />Extremely Stable <br />6 <br />>+2.0 <br />*From Regulatory Guide 1.23, "Onsi[e Meteorological Programs", <br />U.S. N.R.C., Feb. 1972 <br />(1) From Environmental Research and Technology, 1978. <br />• <br />\J <br />2-22 <br />