|Mesoscale Discussion 1188|
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Mesoscale Discussion 1188
NWS Storm Prediction Center Norman OK
0608 PM CDT Thu Jun 29 2017
Areas affected...Southeast SD...eastern NE...Western IA
Concerning...Severe Thunderstorm Watch 381...
Valid 292308Z - 300015Z
The severe weather threat for Severe Thunderstorm Watch 381
SUMMARY...Severe threat will increase across the eastern parts of
WW381 over the next few hours.
DISCUSSION...Well-defined short-wave trough is ejecting across SD/NE
this evening and large-scale forcing for ascent appears to be aiding
convection centered near the SD/NE/IA region. Over the last hour or
so numerous individual thunderstorm elements have begun to cluster
and a weak MCS may be evolving. While a surface boundary draped
across northern IA may help focus this activity, low-level
convergence is not strong along the wind shift. Even so, convective
cold pool should aid eastward propagation of this activity toward
the eastern edge of WW381 within the next 1-2 hours. Large
hail/damaging winds are the primary threats with this convection.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 42999954 43409475 40939475 40549954 42999954
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