444slides.42.032907

444slides.42.032907 - The environment’s flux of...

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Parker
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Davies-Jones et al.
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Scanned from Houze
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Photo by William T. Hark OFB
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Landspouts, waterspouts, and gustnadoes are axamples of non-supercellular tornadoes . They may occur beneath a supercell storm, but the fundamental processes do not require the storm to be a supercell. However, almost all significant (F2 or greater) tornadoes are produced by supercells . The supercellular tornado process is unique in that the supercell produces its own vertical vorticity and then concentrates it into a tornado vortex, without the need for any ambient vertical vorticity.
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Storm moving across vortex lines “crosswise vorticity” Storm moving into vortex lines “streamwise vorticity” “Updraft-flanking vortices” “Helical (rotating) updraft” Storm motion Storm motion
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u v 0 km
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Unformatted text preview: The environment’s flux of streamwise vorticity into the storm is measured in terms of the storm-relative helicity motion of an ordinary cell motion of a supercell Twice the signed area swept out by storm-relative hodograph 10 m/s 10 m/s area=100 m 2 /s 2 =100 J/kg Bluestein V.II A ready source of high SRH air on the stormscale low-level mesocyclone high SRH air from FFD wall cloud + LL meso Parker env. inflow LCL 2 LCL 1 UPDRAFT REGION click anim OFB Photo courtesy Roger Edwards Precip loading in hook, Evaporation, Dynamic effects RFD Photo courtesy Roger Edwards Clear slot from subsidence RFD Davies-Jones et al. High momentum RFD surge Fujita Bluestein V.II Davies-Jones et al. Parker T Parker T Parker T...
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