Time-Altitude Cross-Section of Horizontal Wind Velocity Near Typhoon Nari, 2001The figure below shows the temporal changes in the altitude distribution of horizontal winds from Sept. 7 to Sept. 8, 2001, during the approach of typhoon Nari. The vertical axis represents the height above the radar, from 0 to 18 km. Wind velocity below 8 km was greatest from 18:00 on Sept. 7 to 9:00 on Sept. 8, when the typhoon was closest, while wind direction changed over time as easterly winds gave way to southerly winds. The maximum observation altitude was situated near the center of the typhoon, at 17 km. As humidity decreased after the typhoon passed, maximum altitude was reduced to approximately 12 km. Since then, adjustments have been made to the radar, and presently the average limit to observation altitude is approximately 13 km.  100KB/GIF-file 
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