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337 JOURNAL OF APPLIED METEOROLOGY VOLUME 19 TABLE 3. Multiple correlation coefficients (Mult R) for each step in the multiple regression analyses, and individual correlation coefficients (R) from simple linear regression analyses. TOP.ax z",a. VOLlO VOL30 VOL40 AREAlO AREA30 ARElI.to RVOLMP RRA TEMP Step "ar'iable Variable 'iariable Variable Variable Variable VaT; able Variable Variable Variable entered entered entered entered entered ent ered entered entered entered entered Hult Indiv Hult Indi. M"lt Indiv Mult Indi. Mult Indi. M"lt Indiv Mult Indiv Mult Indiv Mult Indiv M"lt Indi. R R R R R R R R R R R R R R R R R R R R No. of cases 25 24 26 23 25 26 25 25 25 26 L1100 PW850 WSP0700 L1100 WSP0500 WSP0700 WSP0700 WSP0700 WSP0700 WSP0300 0.66 -0.66 0.51 0.51 0.59 0.59 0.58 -0.58 0.64 0.64 0.62 0.62 0.68 0.68 0.55 0.55 0.73 0.73 0.55 0.55 LEVO WSP0700 L1100 WSP0500 HI 1sfc L1100 TTI L1100 TTI 0.77 0.52 0.56 0.31 0.76 -0.44 0.70 0.55 0.73 0.54 0.68 -0.47 0.73 -0.26 0.71 0.45 0.82 -0.35 0.69 0.50 IIDIR700 lID IR500 WSHEAR IIDIRSOO LEVO L1lOO Tsfc LEVa WSHEAR WOIR700 0.79 -0.27 0.59 -0.28 0.78 -0.15 0.74 -0.23 0.74 0.32 0.75 -0.23 0.77 -0.39 0.74 0.27 0.82 -0.19 0.74 -0.15 4 WSHEAR LEVa IIDIR500 LEVa WOIR300 WSHEAR WOIR700 WO IR850 WO IR 700 LEVa 0.81 0.31 0.61 0.23 0.78 -0.37 0.77 0.26 0.77 0.07 0.76 -0.35 0.78 -0.41 0.75 0.01 0.83 -0.52 0.79 0.34 IIllR850 LEV_20 IIllR850 WSHEAR lID IR500 WSHEAR W01R700 Tsfe WOIR850 0..62 -0.21 0.78 -0.25 0.79 -0.04 0.78 0.05 0.77 -0.43 0.78 -0.23 0.76 -0.13 0.83 -0.31 0.80 -0.21 cases by bringing in the additional three terms was only 0.06 (range 0.01-0.11). 4. Discussion With the limited number of cases studied, it is impossible to draw firm conclusions from the present investigation. Also, this analysis cannot be gen- eralized without further testing, preferably in the a priori framework. However, results of the present study can at least provide evidence for deciding whether or not further investigation is warranted. Results are quite encouraging'. The stability in- dexes and wind speed variables seem to exert rela- tively strong influences on the size, intensity and coverage of convective precipitation that can occur. The water vapor-stability terms provide a measure of the moisture available and the overturning po- tential of the atmosphere. One may conjecture that the upper level wind maxima are associated with the ....... .~ ....,.,~ largest values of upper tropospheric divergence (Newton and Palmen, 1963) which when combined with other pertinent meteorological factors can re- sult in large-scale convective activity. Beebe and Bates (1955) hypothesized that upper tropospheric divergence superimposed over low-level moisture, instability and convergence produce severe weather. REFERENCES Beebe, R. G~, and F. C. Bates, 1955: A mechanism for assist- ing in the release of convective instability. Mon. Wea. Rev., 83, 1-10. Galway, J. G., 1956: The Lifted Index as a predictor of latent instability. Bul/. Amer. Meteor. Soc., 37, 528-529. Marshall, J. S., and Wm. K. Palmer, 1948: The distribution of raindrops with size. J. Meteor., 5, 165-166. Newton, C. W., and E. Palmen, 1963: Kinematic and thermal properties of a large-amplified wave in the westerlies. Tel/us, 15, 99-119. Schroeder, M. J., and G. E. Klazura, 1978: Computer process- ing of digital radar data gathered during HIPLEX. J. Appl. Meteor., 17, 498-507.