Previous studies show that a single observation of tall precipitation in a hurricane's eyewall is often associated with intensification of that hurricane's surface wind. Using WSR-88D radars, we show that repeated observation of precipitation height provides even more information about wind intensification. If the frequency of tall precipitation in the eyewall is at least 33% (1 in 3 radar volume scans), we find an 82% chance of wind intensification. If this threshold is not met, the chance of wind intensification drops from 82% to just 17%. We show that the WSR-88D height measurements are reasonable using the TRMM Precipitation Radar.