Got ya
By mid-afternoon, forecast hodographs
depict some 25-30 kt of 0-1 km storm-relative flow to sustained
and uninterrupted updrafts. However, mid- to upper-level flow will
be modest to weak at best, suggesting precipitation will falling
close proximity to what will likely be spatially small updrafts.
Taken together, any shower or thunderstorm where the downdraft is
just far enough removed from the updraft will have the potential
to support transient low-level mesocyclone with an associated
threat for a brief, likely weak (EF-10 to EF-1 caliber), tornado.
Such a threat appears maximized from about 2 to 8 PM. It`s worth
noting this system does not have the hallmarks of a surprise high-
shear/low- cape (HSLC) severe weather event but rather a "got ya"
type event given the moist and sheared low-level environment. For
a more substantial threat, we`d expect a regime in which a
surface low would be rapidly deepening while on a closer approach
providing a much deeper layer of shear as well as the means to
locally augment low-level instability via dynamically lifting a
moist-absolute unstable layer. We don`t look to have any of that
tomorrow. In addition, the threat for damaging hail and winds
looks exceedingly low (<5%) due to the expected shallow depth of
convective cores as well as lack of storm-scale organization to
develop a cold pool in an otherwise moist and unfavorable
environment. So, it`s one of those rare "weak tornado or nothing"
environments, notwithstanding the dangers of lightning.