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000
ACUS11 KWNS 210425
SWOMCD
SPC MCD 210425
SDZ000-210530-

Mesoscale Discussion 1374
NWS Storm Prediction Center Norman OK
1125 PM CDT Thu Jul 20 2017

Areas affected...Northern SD

Concerning...Severe Thunderstorm Watch 427...

Valid 210425Z - 210530Z

The severe weather threat for Severe Thunderstorm Watch 427
continues.

SUMMARY...Thunderstorms will spread across mainly the northern
two-thirds of WW427 over the next few hours. Gusty winds and
marginally severe hail are the primary threats.

DISCUSSION...Squall line that produced severe wind gusts across
northwestern SD has propagated east of the MO River and appears to
be gradually weakening. Even so, this activity is supported by a
modest LLJ which should support convective threat across northern SD
into the early morning hours. Boundary-layer decoupling and
increasingly elevated updrafts suggest overall intensity should
gradually diminish.

..Darrow.. 07/21/2017

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

ATTN...WFO...FSD...ABR...

LAT...LON   45820042 45899813 44579812 44520044 45820042




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