SPC MD 1276

MD 1276 CONCERNING SEVERE THUNDERSTORM WATCH 411… FOR PARTS OF CENTRAL MT

Mesoscale Discussion 1276
NWS Storm Prediction Center Norman OK
0516 PM CDT Fri Jun 13 2025

Areas affected...Parts of central MT

Concerning...Severe Thunderstorm Watch 411...

Valid 132216Z - 132345Z

The severe weather threat for Severe Thunderstorm Watch 411
continues.

SUMMARY...Supercells will spread eastward with time, with a threat
of large to very large hail, localized severe gusts, and possibly a
tornado.

DISCUSSION...Several supercells are ongoing late this afternoon
across central MT. Strong deep-layer shear (effective shear of
greater than 50 kt) and gradually increasing low-level moisture and
buoyancy with eastward extent will help to maintain these supercells
as they move eastward through late afternoon. 2-inch hail was
reported earlier in Wheatland County, and elongated hodographs and
favorable storm mode will continue to support large to very large
hail potential. Localized severe gusts of 60-80 mph will also be
possible. Low-level flow is relatively weak, but backed surface
winds, relatively favorable low-level moisture, and effective SRH
approaching 100 m2/s2 will also support some tornado potential with
the strongest cells.

..Dean.. 06/13/2025

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...BYZ...GGW...TFX...

LAT...LON   45981036 47380848 47520747 47270689 46970677 46450704
            46110763 45700856 45601034 45981036 

MOST PROBABLE PEAK TORNADO INTENSITY...85-115 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN

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2025-06-13 22:18:03