RFGFRecombinant Fibroblast Growth Factor
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An elongated reflectivity core formed between the occluding circulation and the primary updraft (Figure 9(d), x = -9, y = 23) as the hook echo region underwent significant changes, particularly along the primary RFGF where two inflow notches were observed.
Despite the surging outflow relative to the occluding circulation, the RFGF remained underneath the midlevel updraft (Figure 10), similar to the 8 June 1995 McLean, TX, storm of Dowell and Bluestein [6].
Interestingly, the southwestern band of updraft that had been prevalent for more than 30 minutes during the mature and occluding stage of the second mesocyclone evolution had weakened considerably and no longer separated the old SRFGF from the primary RFGF.
The occluded portion of the RFGF was at the center of the so-called vorticity-rich region in the Burgess et al.
By the end of the new organizing stage, the new SRFGF was nearly indistinguishable with the old SRFGF, which had merged with the primary RFGF on the western side of the domain (Figure 9(e)).
The mesoanticyclone associated with the anticyclonic tornadoes during the third cycle caused the RFGF to bend northward and potentially slowed the southward advances of the SRFGFs associated with the occluding and developing circulations.
The southern part of the primary RFGF did not push farther southward until the SRFGF progressed around the southern edge of the second mesocyclone circulation (Figures 14(e)-14(g)).
The onset of the occlusion stage after 0045 UTC was marked by a southeastward surge in the primary RFGF, while the SRFGF remained with the occluding circulation.
It is important to note that the SRFGFs did not reach the primary RFD gust front (RFGF) until the occlusion stage.
The RFGF, SRFGF, and the FFCB all converged to a triple point on the north side of the circulation for most of the life cycle of the mesocyclone.
Regardless, it is clear that the second mesocyclone's intensification was due to an occlusion-type updraft and not the main updraft along the primary RFGF. The analyses documented here will provide a framework for future studies that examine differences in storm-scale kinematic structure between tornadic and nontornadic supercells, particularly as more long-duration supercell data sets are collected and analyzed.