Abstract: A number of instruments were placed on the ground across the path of a large tornado that passed west of the town of Allison, Texas, on June 8, 1995. The center of the tornado came within 660 m of the closest instrument, which recorded a pressure drop of 55 mbar and a subsequent pressure rise of 60 mbar. During the lowest recorded pressures (near r = 660 m), there were large and rapid pressure fluctuations; the largest fluctuation was a 10‐mbar spike lasting 2 s. A second instrument on the opposite side of the tornado recorded a pressure drop of 26 mbar. From the pressure variations with time P ( t ) at the two instruments, the variation of pressure with distance p ( r ) from the center of the tornado has been deduced for r >660 m. As r decreases, the measured pressure function p ( r ) drops more abruptly than would be expected from conservation of angular momentum of air spiraling inward near the ground level.