Mesoscale Discussion 1380
NWS Storm Prediction Center Norman OK
1241 PM CDT Mon Jun 29 2026

Areas affected...Central North Dakota

Concerning...Severe potential...Watch likely 

Valid 291741Z - 291945Z

Probability of Watch Issuance...80 percent

SUMMARY...The potential for severe thunderstorms capable of all
hazards is expected to increase by 19-20Z. A watch is likely.

DISCUSSION...Recent trends in visible satellite and radar data
indicate a gradual increase in shower and thunderstorm development
across western ND into northwest SD. That activity is located to the
west of a n-s-oriented stationary front/inverted trough located over
central ND and within a zone of increased forcing for ascent
preceding a short-wave trough and associated mid-level jet streak
pivoting through eastern WY. To the east of the front, dewpoints in
the 70s and a gradually warming boundary layer are contributing to a
moderately unstable and increasingly uncapped air mass with MLCAPE
of 1000-2000+ J/kg, per latest objective analysis.

The current expectation is for surface-based storm development to
occur in the vicinity of the front/trough by 19-20Z within a
kinematic environment featuring low-level easterly winds veering to
southerly in the mid/upper levels with 50-60 kt of effective bulk
shear. As such, the potential will exist for initial supercell storm
modes with an associated risk for large to very large hail and
perhaps a few tornadoes. There is some signal in recent CAM guidance
that initial storms could evolve into bowing segments, which would
be supportive of an increased damaging wind threat.

..Mead/Guyer.. 06/29/2026

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

ATTN...WFO...FGF...BIS...

LAT...LON   46630121 47940135 48710100 48939969 48699864 47839809
            47199851 46629898 46189942 46090048 46630121 

MOST PROBABLE PEAK TORNADO INTENSITY...100-125 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN