ACUS11 KWNS 271837
SWOMCD
SPC MCD 271837=20
KYZ000-INZ000-272030-

Mesoscale Discussion 0570
NWS Storm Prediction Center Norman OK
0137 PM CDT Mon Apr 27 2026

Areas affected...central and southern Indiana

Concerning...Severe Thunderstorm Watch 159...

Valid 271837Z - 272030Z

The severe weather threat for Severe Thunderstorm Watch 159
continues.

SUMMARY...The threat for large hail and damaging winds is expected
to continue across west-central into southern Indiana.

DISCUSSION...Ahead of a long-lived, bowing line segment approaching
the IL/IN border near Terre Haute, a cluster of semi-discrete,
elevated storms is ongoing over southwest IN. The primary warm
sector and reservoir of surface-based instability remains to the
west of the watch area over central and southern MO into southern
IL. However, strong moisture and heat fluxes occurring along a 50-55
kt low-level jet (per KVXW and KPAH VWPs) are supporting MUCAPE of
upwards of 1000 J/kg into western IN as of 18z. The slow eastward
migration of the low-level jet will support the continued eastward destabilization of the air mass across IN this afternoon, at least
for elevated parcels.=20

Given the presence of strong cloud-bearing shear in place (i.e.,
effective bulk shear magnitudes of 50-60 kt), organized storm modes
will remain possible. Large hail will continue to be the primary
severe weather hazard with the greatest potential for locally
damaging wind gusts being with the aforementioned line segment
moving into western IN.

..Mead.. 04/27/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!62_sTVLUDRdg2-s4ereZAk1e0_FMlgqxgeC4W0sAkYOKB6-AyM6QhBGElroV8t1EBtt8Do9e-= tdOi8xezJTihpmYn00$ for graphic product...

ATTN...WFO...ILN...LMK...IND...PAH...

LAT...LON 38238741 39628748 40178711 40288609 39668546 38458533
38108559 37988615 37838668 37998712 38238741=20

MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


=3D =3D =3D
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