...Parts of southern into middle Atlantic Seaboard...
Scattered thunderstorm activity may be ongoing at 12Z Tuesday, ahead
of the cold front, in the presence of at least modestly sheared and
strong southwesterly deep-layer mean flow, from the lee of the
southern Appalachians through northern Florida.
Coupled with the development of the frontal wave/cyclone, models
indicate an influx of seasonably moist air (including surface dew
points near 70F) across the Carolina coastal plain into the piedmont
by early afternoon. Although lower/mid tropospheric lapse rates may
not be particularly steep, it appears that this still may contribute
to mixed-layer CAPE of 500-1000 J/kg. In the presence of south to
southwesterly wind fields including 30-40+ kt around 850 mb, and
50-60+ kt in the 700-500 mb layer, it appears that the environment
could become conducive to organized severe thunderstorm development.
Mid/upper support for large-scale ascent across the Carolinas could
be glancing, but lift associated with lower/mid tropospheric warm
advection may be conducive to the initiation of discrete
thunderstorms by midday, including a few supercell structures, with
potential for at least some upscale growth across the North Carolina
coastal plain through Tuesday afternoon. This may be accompanied by
the risk for a couple of tornadoes, in additional to potentially
damaging wind gusts.
...MAXIMUM RISK BY HAZARD...
Tornado: 5% - Slight
Wind: 15% - Slight
Hail: 5% - Marginal