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eh <br />ESPEY, HUSTON &ASSOCIATES, INC. <br />C~ <br />cold, dry air during the storm-free periods. In the summer, the predominant air <br />masses over the region aze continental tropical and, less often, maritime polaz. <br />During the summer, the region is well south of the mean storm track. If <br />a local or air mass moisture source is available, surface heating and upslope flow are <br />quite localized, and thunderstorms aze usually of only moderate intensity and are <br />not normally accompanied by hail or violent weather. <br />• <br />• <br />H-4 <br />