|Mesoscale Discussion 1334|
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Mesoscale Discussion 1334
NWS Storm Prediction Center Norman OK
0622 PM CDT Mon Jul 17 2017
Areas affected...MN...northwest WI
Concerning...Severe Thunderstorm Watch 418...
Valid 172322Z - 180015Z
The severe weather threat for Severe Thunderstorm Watch 418
SUMMARY...Severe thunderstorm threat will focus across the southern
and eastern portions of WW418 over the next several hours.
DISCUSSION...Multiple thunderstorm clusters are congealing into a
larger complex of storms over the western half of WW418. As this
complex matures over the next few hours a larger precip shield will
likely evolve and with it perhaps a strengthening outflow boundary.
In the short term, several supercells have evolved ahead of a
surface low from Douglas County MN to Morrison County MN. MRMS data
suggests very large hail (possibly around 2 inch in diameter) is
noted with the Morrison County supercell. While large hail is the
primary severe threat, SRH is locally enhanced near an old outflow
boundary that is currently draped across northern WI west along the
southern fringe of WW418. Strongest storms should focus along/near
this boundary and a tornado can not be ruled out; although complex
storm mode is not particularly favorable for this development.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 47089618 47459160 45879160 45509620 47089618
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