 PHILADELPHIA--BUSINESS WIRE--Home prices across the United States continued to climb in August, rising at an annualized 15.9 percent from the prior month, the third consecutive month reporting an all-time record month-over-month rate, according to Radian Home Price Index HPI data released today by Red Bell Real Estate, LLC, a Radian Group Inc. company NYSE: RDN. The company believes the Radian HPI is the most comprehensive and timely measure of U.S. housing market prices and conditions av 