The resulting vertical vorticity
, 0.4 [s.sup.-1], is similar to that of dust devils and as large as that of some small tornados (Bluestein et al.
They are caused when vertical vorticity
fields along the gust front wrap up and stretch quickly.
By 0011 UTC (Figure 3(c)), the new SRFGF had surged westward, overtaking the old outflow region, as the RFD strengthened (Figure 3(d), x = -54, y = 27) and the low-level updraft zone and vertical vorticity field became better organized (Figures 3(b) and 3(d)).
Evolution of Vertical Vorticity. Initially at 2358 UTC, the developing low-level mesocyclone vortex (Figure 3(b), x = -53, y = 25) was small, symmetric, and collocated with an updraft while also decreasing in size with height (Figure 4(b)).
A mesocyclone usually possesses a diameter between 2 and 10 km and a vertical vorticity
on the order of 0.01 [s.sup.-1] or greater (American Meteorological Society 2016).
Further, Section 3 describes a method for identifying hazardous rain-cells that may cause Guerrilla-heavy rainfalls using vertical vorticity
values inside rain-cells obtained by Doppler radar observation.
The results of this new article probably at least partly explain why.--Paul Markowski (Penn State University) and Yvette Richardson, "Large sensitivity of near-surface vertical vorticity
development to heat sink location in idealized simulations of supercell-like storms," in a forthcoming issue of the Journal of the Atmospheric Sciences.
The right split storm exhibits strong positive vertical vorticity
at the beginning of the period with a weaker anticyclonic counterpart on the northwest side of the mesocyclone.
(2014) simulated a tornadic supercell using ARPS in which the tilting of frictionally generated horizontal vorticity was cited as an important source of near-ground vertical vorticity
. In Schenkman et al.
The conditions associated with tornadoes have been extensively studied and include contributions from an environment conducive to deep moist convection and a source of easily stretched low-level vertical vorticity
(Doswell et al.
Both the secondary and tertiary eyewalls contracted with time, as clearly illustrated in the time-evolution of axisymmetric reflectivity, tangential winds, and vertical vorticity
Figure 6 indicates that the horizontal flow relative to the translating MV is filled with positive vertical vorticity
peaking at about 12 x [10.sup.-3] [s.sup.-1] at the lowest analysis level of 1 km AGL.