.LONG TERM...
(Wednesday night through Monday)
Issued at 336 AM EDT Tue May 7 2024
An ongoing potentially
active weather period will characterize the
start of the long term forecast Wednesday night into Thursday
morning.
Convection, some
likely severe, will be in progress
somewhere across the Tennessee Valley in the form of one or multiple
MCSs Wednesday night. This activity should gradually progress east-
southeastward in the well in advance of the surface cold
front
through Thursday morning. Models tend to struggle in this type of
environment regarding the placement/timing of
convection, so a
significant degree of uncertainty does remain. With that said, in
general
PoPs will be on the increase across north Georgia from
late Wednesday night into Thursday morning with some associated
severe potential also increasing through this time. Given 0-6 km
bulk
shear values of 40-50+ knots, damaging wind gusts would be
the primary concern with any convective complex that could enter
north Georgia with large
hail and perhaps an embedded brief spin-
up
tornado threat as well. To highlight this potential,
SPC has
maintained a
Slight Risk for far north Georgia and a Marginal Risk
down to roughly I-20 for the late Day 2 period from late
Wednesday night into early Thursday morning.
As we
head later in the day on Thursday, the surface cold
front will
begin to approach and push into the area. The
front will get its
most sustained push into the area by Thursday afternoon as the upper
trough deepens across the Great Lakes. Additional
convection will
likely develop in advance of the
front by Thursday afternoon, though
coverage and degree of additional severe potential will to some
degree depend on the evolution of morning
convection and any
lingering boundaries/
cold pool. If forecast
instability is
realized, a resurgent severe threat would be
likely by Thursday
afternoon/evening. Amid still-favorable deep layer
shear and 6-7
C/km lapse rates, damaging wind gusts and large
hail could be
expected. A Day 3
Slight Risk thus envelopes most of the area
generally along and south of the I-85 corridor to account for this
risk. Lastly, models continue to highlight a potential eastward-
moving
MCS that would track along/north of the Gulf coast late
Thursday into Thursday night that could possibly skirt southern
portions of the area and perhaps pose an additional severe risk.