ACUS11 KWNS 270113
SWOMCD
SPC MCD 270113=20
NEZ000-SDZ000-NDZ000-MTZ000-WYZ000-270315-

Mesoscale Discussion 1343
NWS Storm Prediction Center Norman OK
0813 PM CDT Fri Jun 26 2026

Areas affected...parts of southeastern Montana...western South
Dakota...western Nebraska

Concerning...Severe Thunderstorm Watch 398...400...

Valid 270113Z - 270315Z

The severe weather threat for Severe Thunderstorm Watch 398, 400
continues.

SUMMARY...Strong to severe wind gusts may become more prominent with
growing thunderstorm clusters overspreading the region, before
activity begins to weaken by 9-10 PM MDT.

DISCUSSION...Moisture return into the vicinity of the deepening
surface troughing to the lee of the Rockies has been modest, but
sufficient to support a narrow corridor of CAPE on the order of
1000-2000 J/kg, in the presence of steep lapse rates. Largest
potential instability remains focused south-southeast of the Black
Hills, with strengthening outflow associated with upscale growing
convection likely to progress through much of the instability axis
by 03-04Z. Until then, the risk for severe hail will probably
persist in stronger cells another hour or two, before more
widespread strong to severe gusts becomes more prominent.

..Kerr.. 06/27/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-b8I4DiH_Ob8pZj1pDiivoNHEapab4rExR4GyJdh2e5hnaLgV4UoKjPhG3BbtFyHtBCUcN7m6= m8wAjlFYh38fJw1e2w$ for graphic product...

ATTN...WFO...BIS...LBF...UNR...CYS...BYZ...

LAT...LON 46240425 45370231 44170144 42700143 41590236 41830316
42640280 43640390 44420400 45770512 46240425=20

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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