ACUS11 KWNS 180729
SWOMCD
SPC MCD 180729=20
WVZ000-OHZ000-KYZ000-INZ000-ILZ000-180900-

Mesoscale Discussion 1177
NWS Storm Prediction Center Norman OK
0229 AM CDT Thu Jun 18 2026

Areas affected...Southern Indiana...Far Southern Ohio...Northern and
Central Kentucky

Concerning...Tornado Watch 347...

Valid 180729Z - 180900Z

The severe weather threat for Tornado Watch 347 continues.

SUMMARY...A threat for isolated severe wind gusts and a tornado risk
will continue over at least the next hour or two across southern
Indiana, far southern Ohio and northern/central Kentucky. A weather
watch extension or replacement will likely be needed to the south of
watch 347.

DISCUSSION...A band of strong storms is currently ongoing along an west-southwest to east-northeast oriented zone of maximized
low-level convergence, associated with an outflow boundary. From
near and to the south of this boundary, moderate instability is
analyzed by the RAP with MLCAPE estimated from around 1000 J/kg in
northern Kentucky to near 2500 J/kg in far southern Indiana and
west-central Kentucky. Over the last couple of hours, instability
has increased to the south of the boundary, and this trend will
likely continue. For this reason, a severe threat is expected to
persist for a few more hours as the band gradually sags
southeastward toward the stronger instability. Although storm mode
is not particularly favorable, regional WSR-88D VWPs do show very
strong low-level shear with 0-3 km storm-relative helicity exceeding
500 m2/s2. This should support a tornado threat with rotating cell
elements within the band. An isolated potential for severe wind
gusts is also expected, especially with bowing parts of the line.

..Broyles.. 06/18/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!9mMm4sfEIrVIWGUeYTbU8_Ww-3OCoEs9rWOW_4LsvoxnwXWlvR3lujp1MD8GqhDUx56qPmWeV= yj0d-nhxEYxBU9pay4$ for graphic product...

ATTN...WFO...RLX...JKL...ILN...LMK...IND...PAH...

LAT...LON 38468774 38618735 38768674 38928585 39128469 39238324
39098279 38748248 38308247 37928270 37738345 37498588
37498722 37618764 37848788 38278794 38468774=20

MOST PROBABLE PEAK TORNADO INTENSITY...140-170 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN


=3D =3D =3D
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