Shreveport AFD:
Higher confidence in a potentially widespread severe weather event
hinges on the timing of these features aligning during the peak of
afternoon heating as the upper
trough will take on an increasingly
negative
tilt as it pivots NE directly over the region by late
Sat
afternoon into the early evening. The strong forcing combined with
very robust
shear profiles along the
deepening sfc low warrants
ample cause for concern as it relates to the threat for tornadoes.
The likelihood of some discrete supercells developing during the
afternoon seems like a foregone conclusion with this very favorable
setup. Model progs seem to indicate a gradual transition to a more
linear convective mode later in the event by late afternoon through
the early evening hours. All that said, expect all modes of severe
weather to be in play for the duration of Saturday afternoon and
possibly a bit later. The other concern will be for some localized
flooding where very heavy
rainfall could occur with individual cells
as well as training storms. This could lead to some
flash flooding
concerns which is why all of the region is also included in a Slight
Risk for excessive
rainfall on Saturday.
Convection should gradually
diminish through the evening and overnight hours as dry slotting
occurs behind the ejecting upper
trough with the cold
front exiting
the region by daybreak on Sunday. Expect improving conditions during
Sunday as temperatures will only climb into the 60s for highs.