What is already known:
What this study adds:
One-half-degree gridded daily-projection precipitation model output from two combinations of the Canadian Regional Climate Model (CRCM)—one driven by the Community Climate System Model (CCSM) and another by the Canadian Global Climate Model 3 (CGCM3)—was obtained from the North American Regional Climate Change Assessment Program (NARCCAP). Gridded observational daily precipitation data were used as a reference to a 1971-1995 historic period and as a basis for validating the projection data. Validation suggested strong bias in the projection data, which necessitated that they be bias-corrected using a mean-value technique. Both the observational and projection data were ranked and assigned percentile values as a means of identifying and quantifying possible changes in extreme precipitation during a historic 1971-1995 and a future 2041-2065 period over two 1/2-degree grid squares centered over Houston and Oklahoma City. Overall results of the percentile analysis suggested that, for the highest percentile rankings, the daily precipitation values associated with a given percentile ranking will increase by the 2041-2065 period. For more moderate percentile rankings, the tendency toward change was less clear. For lower percentile rankings (approximately the 80th), there was indication that the values associated with a given percentile ranking will decrease by the future period. Analysis also suggested that a more sophisticated bias-correction procedure based on rain rate is necessary.