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Robert W. Burpee

circulation disappeared (usuallyestimated to be between 8 and 12 km for mature hurricanes). The streamlines that he sketched at that levelindicated the direction of motion of the storm for thenext 12-24 h. In later years, when more winds becameavailable near the storm center and objective studiesshowed that the "steering level" was in the middle troposphere, but varied from storm to storm, better techniques came into vogue. Nevertheless, Grady's use ofthe upper winds frequently helped him make

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Howard B. Bluestein

fly a pattern by the storm while the tornado was developing owing to intervening convection. However, analysis of airborne radar data before the tornado had formed and analysis of the portable radar data suggested that the tornado had formed in a circulation along the leading edge of the hook echo. On 29 May the complete life cycle of a tornado was captured, for the first time, by the NOAA P-3 airborne Doppler radar, near Newcastle, Texas ( Wakimoto and Atkins 1996 ). Unlike in COPS-91, the

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