Extended Abstract (572K)P11.9
A case of supercell intensification along a preexisting boundary—Clay County Nebraska tornado of 22 September 2001
Jared L. Guyer, NOAA/NWS, Hastings, NE
In the early evening hours of 22 September 2001, a supercell thunderstorm developed along an advancing prefrontal trough in an ambient environment ripe for severe convection. This supercell initially produced a weak tornado in northern Clay County, Nebraska, before intensifying as it interacted with a preexisting outflow boundary.
As this supercell intensified and tracked southeast, it produced an F3 tornado, which caused damage to several farmsteads in rural Clay County, Nebraska along its 8 mile path.
It is theorized the intensification of this supercell and subsequent tornadogenesis was enhanced by 1) the preexisting mesoscale boundary and 2) other storm-scale processes. Furthermore, the complete life cycle of this supercell occurred within 30 miles of the Hastings-Blue Hill (KUEX) Doppler radar.
Poster Session 11, Tornadic Storms
Thursday, 15 August 2002, 3:00 PM-4:30 PM
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