Subj : DAY48SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Fri Nov 17 2023 10:02:19

ACUS48 KWNS 171002
SWOD48
SPC AC 171000

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0400 AM CST Fri Nov 17 2023

Valid 201200Z - 251200Z

....DISCUSSION...
....D4/Monday - ArkLaTex into parts of the Southeast...
Extended-range guidance is in general agreement regarding the
synoptic-scale pattern across the CONUS on D4/Monday. A vigorous
mid/upper-level shortwave trough is forecast to pivot eastward
across the southern Plains/ArkLaTex region, to the south of a
weakening midlevel cyclone over the central Plains. However,
considerable uncertainty (with regard to both run-to-run
deterministic changes and ensemble spread) remains regarding the
details, which will impact the magnitude and placement of the
primary severe-thunderstorm threat on D4/Monday.

Generally speaking, mid 60s F dewpoints are expected to advance
northward across parts of east TX into the lower MS Valley, east of
a surface cyclone and trailing cold front that will approach the
ArkLaTex/ArkLaMiss regions by early evening. Initial thunderstorm
development is expected by late afternoon across parts of east TX,
with an increase in storm coverage Monday night as the shortwave
pivots through the base of the positively tilted trough. Strong
deep-layer shear will support organized convection and at least some
severe-thunderstorm threat where sufficient destabilization can
occur. The threat is likely to be maximized near and just south of
the surface-low track, which remains somewhat uncertain at this
time.

....D5/Tuesday - Parts of the Southeast...
Depending on the timing and intensity of the primary mid/upper-level
shortwave trough and surface cyclone, some severe threat may linger
into Tuesday across parts of the Southeast, within an environment
characterized by relatively rich low-level moisture, strong
deep-layer flow/shear, and weak instability. A separate area of
threat could materialize across parts of the Carolinas Tuesday
night, in association with a secondary low-level moisture surge, but
uncertainty regarding instability remains too high to include any
15% areas at this time.

...Dean.. 11/17/2023

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