Subj : MESO: Mesoscale Discussion 1333
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Jun 29 2023 12:23:05

ACUS11 KWNS 291222
SWOMCD
SPC MCD 291222=20
KYZ000-INZ000-ILZ000-291315-

Mesoscale Discussion 1333
NWS Storm Prediction Center Norman OK
0722 AM CDT Thu Jun 29 2023

Areas affected...Portions of eastern IL into western/southern IN and
western/central KY

Concerning...Severe Thunderstorm Watch 412...

Valid 291222Z - 291315Z

The severe weather threat for Severe Thunderstorm Watch 412
continues.

SUMMARY...An isolated hail threat continues. Trends are being
monitored for possible watch issuance into parts of western/southern
Indiana and western/central KY.

DISCUSSION...Multiple instances of large hail generally up to golf
ball size have been reported with supercells across eastern IL into
western IN over the past 1-2 hours, with one report of 3+ inch hail.
Some clustering of convection has recently been noted along/near the
IL/IN border as several supercells are beginning to interact with
each other. There is concern that a small cluster may evolve from
these interactions and spread south-southeastward across parts of
western/southern IN into western/central KY over the next couple of
hours. This cluster would probably track along the elevated
instability gradient, with access to ample buoyancy to support
surface-based thunderstorms. In addition to the continued threat for
large hail in the short term, the risk for severe/damaging winds
should increase when this small cluster develops in tandem with a
destabilizing boundary layer and steepening low-level lapse rates. A
new Severe Thunderstorm Watch for parts of IN/KY is being
considered.

...Gleason/Thompson.. 06/29/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!6jovXNWOlpuGIDQxPZL-sikjYFBM7tEj-EATFWJ7U8ELfBitXyeqLODPNM2vXCtiRyWUrIx5Q=
qtxSwQaALdWGqkD0ns$  for graphic product...

ATTN...WFO...LMK...IND...PAH...ILX...

LAT...LON   39988828 39028670 37238580 37038734 38778785 39988828=20


=3D =3D =3D
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