Subj : MESO: Mesoscale Discussion 0505
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sun Apr 20 2025 22:09:19

ACUS11 KWNS 202208
SWOMCD
SPC MCD 202207=20
TNZ000-ARZ000-MSZ000-MOZ000-LAZ000-202300-

Mesoscale Discussion 0505
NWS Storm Prediction Center Norman OK
0507 PM CDT Sun Apr 20 2025

Areas affected...Central and Eastern Arkansas

Concerning...Tornado Watch 154...

Valid 202207Z - 202300Z

The severe weather threat for Tornado Watch 154 continues.

SUMMARY...Thunderstorms will continue east across Arkansas this
afternoon and evening. The low-level environment will remain
supportive of tornadoes. A new Tornado Watch will likely be needed
across eastern Arkansas -- to the east of the existing watch --
within the hour.

DISCUSSION...A mixed-mode (linear segments and discrete cells) line
of thunderstorms continues to move east across Arkansas this
afternoon. The environment along and ahead of these storms is
characterized by 100-mb mixed-layer CAPE around 1000 J/kg and
effective-layer shear around 50-60 knots. Additionally, the Little
Rock VAD depicts strong low-level curvature with 0-1 km SRH
averaging around 180-190 m2/s2 over the last hour. Discrete
thunderstorms moving from southwest Arkansas toward central Arkansas
have shown increasing organization/mid-level rotation, with
broadcast media reporting a tornado recently in Garland County.=20

This environment should evolve east across the state this evening,
supporting a continued tornado threat east of the ongoing tornado
watch. With Tornado Watch 154 scheduled to expire by 00 UTC / 7 PM
CDT, a new tornado watch for portions of central and eastern
Arkansas will likely be needed within the hour.

...Marsh/Guyer.. 04/20/2025

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!5gQb7dMqAAUWfFETluHqg-owI218c87bF5rvtD30gFREp2vhIaLs-nzhsOkgKXNKDjL0hGTah=
CCnreXVqbtGdUdVWlQ$  for graphic product...

ATTN...WFO...MEG...JAN...LZK...SGF...SHV...

LAT...LON   36309300 36529184 36399031 35858986 34309047 34299051
            33299101 32979137 32899293 33049390 33949373 36309300=20


=3D =3D =3D
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