Joint variations of temperature and water vapor over the midlatitude continents

We have used warm-season data from the Atmospheric Radiation Measurement (A RM) Program's Southern Great Plains site to investigate the joint variabili ty of the temperature and moisture soundings, and their relationship to the variability of the generalized convective available potential energy (GCAP E). The actual temperature and humidity soundings vary together in such a w ay as to produce variations of the GCAPE which are far smaller than those w hich would occur if the relative humidity varied while the temperature soun ding was fixed, or vice versa.