SPC MD 1055

MD 1055 CONCERNING TORNADO WATCH 318... FOR WESTERN DAKOTAS

Mesoscale Discussion 1055
NWS Storm Prediction Center Norman OK
0942 PM CDT Mon Jun 29 2020

Areas affected...Western Dakotas

Concerning...Tornado Watch 318...

Valid 300242Z - 300445Z

The severe weather threat for Tornado Watch 318 continues.

SUMMARY...Severe threat is focusing mainly across the western
Dakotas.

DISCUSSION...Earlier supercells that formed over eastern MT/western
ND have merged and grown upscale into a squall line over western ND.
Latest radar data suggests the leading bow-type structure over
Montrail County is moving northeast at 25kt and will likely exit the
watch in a little over 1hr. Given the evolution into a linear MCS,
it appears gusty winds will be the most common threat along the
leading edge of this convection. Even so, some hail threat remains
with embedded supercell structures. Watch will likely need to be
extended downstream to include the northeastern-most counties of BIS
CWA.

..Darrow.. 06/30/2020

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

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

LAT...LON   46000215 47400189 48160174 48870286 49470159 48770011
            47200034 45940147 46000215 

Read more

from SPC Forecast Products http://www.spc.noaa.gov/products/md/md1055.html