Pretty large Enhanced Risk area this far out. Threat includes damaging squall line and supercells capable of all hazards --
...DISCUSSION...
...Wednesday (day 4)--central Gulf Coast into the Mid-South...
A mid-level shortwave trough is forecast to move from the Northeast
into the Canadian maritimes prior to Wednesday with a mid-level
ridge remaining over FL/Bahamas. As a result, a CP airmass will not
likely not infringe on the central Gulf Coast prior to Wednesday.
There is increased agreement in model guidance for the evolution of
a well-defined mid-level shortwave trough forecast to eject
northeast from the southern Great Plains into the OH Valley on
Wednesday into Wednesday night. Models are in good agreement
showing a previously stalled front advancing north across the Deep
South, concurrent with a surface low developing/deepening as it
moves northeastward from the northwest Gulf Coast and into TN/KY by
early evening. Strong to very strong flow fields overspreading a
destabilizing warm sector (featuring low-mid 60s F dewpoints as far
north as parts of northern MS/AL) will support the potential for
organized severe thunderstorms. In addition to a severe squall
line, a supercell risk capable of all hazards is currently forecast.
By Thursday (day 5), the ejecting disturbance will likely become
increasingly displaced from a moist/unstable sector across the
Southeast. However, uncertainty is too high to include a potential
severe area due to thunderstorm evolution/magnitude of
destabilization and predictability of larger-scale features. It
appears severe potential will be minimal by Friday-Sunday (days 6-8)
as the overall pattern becomes less supportive for thunderstorms
over the Lower 48.
..Smith.. 02/09/2020