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ACUS11 KWNS 180304
SWOMCD
SPC MCD 180303
SDZ000-NEZ000-COZ000-180500-
Mesoscale Discussion 0449
NWS Storm Prediction Center Norman OK
1003 PM CDT Thu May 17 2018
Areas affected...Central South Dakota through much of western and
central Nebraska
Concerning...Severe Thunderstorm Watch 100...102...103...
Valid 180303Z - 180500Z
The severe weather threat for Severe Thunderstorm Watch 100, 102,
103 continues.
SUMMARY...The severe threat will continue across the discussion area
for the next couple of hours. Damaging wind gusts are the primary
threat, although large hail remains possible with cellular
convection and more dominant cores.
DISCUSSION...Storms have now mostly congealed into a large,
forward-propagating MCS extending from central South Dakota (near
Pierre) south-southwestward to near Sidney, NE currently. More
cellular convection was located on the southwestern flank of the
complex near the Sidney area, with occasional large hail reported
and indicated on radar. Elsewhere, occasional severe wind gusts
have been reported with the MCS, and this activity should continue
for the next couple of hours or so as storms continue to reside in a north-to-south oriented instability axis across the region. The
remainder of the severe threat will likely be handled with continued
local space/time extensions of ongoing watches, which will be
coordinated with local WFOs as needed. This threat may persist
beyond 05Z in portions of Nebraska, where storms will have a longer
residence time within the axis of moderate instability.
..Cook/Hart.. 05/18/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FSD...ABR...LBF...UNR...BOU...CYS...
LAT...LON 41150323 41430282 41950256 42530227 42970195 43590162
44120120 44490082 44690044 44749997 44619951 44379930
43909920 43119930 42319935 41639968 41110033 40700127
40600230 40700291 41150323
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