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On April 21st, 2001 a supercell thunderstorm
produced a tornado which moved through the town of Hoisington, KS during
the evening hours. Investigation of the observed data for this event indicated
a possible contributor to the storm environment may have been a meso-scale
stratospheric intrusion which nearly escaped measurement by the existing
synoptic scale sounding and wind profiler network. The 0000 UTC Dodge
City upper air sounding which ascended just upstream of the supercell
and in its immediate wake exhibited a substantial lowering of the tropopause
and a distinct layer of weakened and backed wind flow at that level. We
suggest that this may show a narrow ribbon of stratospheric air injected
into the troposphere in close proximity to the upstream side of the storm.
GOES water vapor imagery of the event also suggests this finding. Some
discussion is offered as to the possible significance of this feature
and its relation to the synoptic scale and meso-scale environment of the