More than i thought..lol
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1237 AM CDT Sat Apr 25 2020
Valid 251200Z - 261200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
THE TENNESSEE VALLEY AND SOUTHERN APPALACHIANS...
...SUMMARY...
Scattered, strong to severe thunderstorms are expected to develop
this afternoon across portions of the Tennessee Valley into the
southern Appalachians. A few strong storms may also develop across
south Florida.
...TN Valley/Southern Appalachians...
Sharp mid-level speed max is forecast to eject across AR into
northern AL by 26/00z. This feature is associated with a pronounced
short-wave trough that should encourage strong-severe convection
across the TN Valley during the afternoon. Latest model guidance
continues to suggest a strongly diffluent high-level flow regime
will develop across the TN Valley ahead of the short wave and a weak
surface low is expected to track from the Boot Heel of MO toward
central KY during the afternoon. Very cold mid-level temperatures
will spread east, along/north of the cyclonic jet such that steep
lapse rates will be common, especially as some boundary-layer
warming is anticipated immediately ahead of the Pacific front. While
moisture is seasonally low across the Gulf States into the TN
Valley, 50s surface dew points should yield modest SBCAPE north of
the jet where 500mb temperatures are forecast to be as cool as -18C
at peak heating. Forecast soundings suggest surface parcels will
reach convective temperature by 17-18z and isolated thunderstorms
should initiate within exit region of aforementioned jet. Shear
profiles favor supercells and hail may be the greatest threat with
this activity; although, low-level shear appears adequate for some
tornado potential. Robust convection should spread toward the
southern Appalachians by evening where it will encounter a wedge
front anchored east of the mountains. Some erosion of the cool
boundary layer will be noted across SC into extreme western NC. For
this reason have adjusted severe probabilities to account for
destabilization in this region. Otherwise, air mass will struggle to
recover across the southern Middle Atlantic during the overnight
hours. Even so, sustained warm advection does warrant some threat
for a few strong storms late.