John, last year was quite moderate but 3 of the prior 4 years had near record heat. There were numerous periods of multiple days in the 90's with high humidity. worse yet, there was minimal cooling at night. as a result, older poa greens were stressed and many were lost. Particularly impacted were those with poor air circulation. Even some of the newer grasses experienced trouble in areas of poor circulation. Greens near corners of properties where trees and mounds are used to shield views and noise are particularly vulnerable. In those cases, fans have been used to provide some help. Newer, deeper rooting grasses combined with efforts to improve air circulation such as thinning trees and reducing mounds can be effective and in many cases may eliminate or at least reduce the need for fans.