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ACUS11 KWNS 132324
SWOMCD
SPC MCD 132323
WIZ000-ILZ000-IAZ000-140130-

Mesoscale Discussion 1052
NWS Storm Prediction Center Norman OK
0623 PM CDT Fri Jul 13 2018

Areas affected...portions of northeast Iowa...southern Wisconsin and
northwest Illinois

Concerning...Severe Thunderstorm Watch 276...

Valid 132323Z - 140130Z

The severe weather threat for Severe Thunderstorm Watch 276
continues.

SUMMARY...The threat for damaging winds and marginally severe hail
will continue across valid portions of the watch area.
Additionally, a risk for isolated damaging downburst winds will
exist just south of the watch area through 01Z.

DISCUSSION...A small bowing line of severe thunderstorms extended
from far southwest WI into northeast IA at 2315Z, with a history of strong/severe winds. Other severe storms with marginally severe
hail and the potential for strong downburst winds were occurring
farther east along a frontal boundary to Sheboygan County, WI. The
downstream environment will remain moderately unstable into
south-central WI, with somewhat drier air closer to the Lake
Michigan shore resulting in weak buoyancy. Overall, a continued
risk for damaging winds and isolated large hail should continue
through around 02Z as storms move east/northeast across the watch
area.

Isolated severe storms were occurring south of the watch from the
Davenport, IA vicinity into adjacent portions of northwest IL. A
recent wind gust to 75 mph was reported in Davenport with a
localized downburst. Although deep-layer shear is weaker in this
area (below 30 kts), moderate/strong surface-based instability will
remain supportive of strong/severe gusts as storms move northeast
into the watch area over far northwest IL during the next 1-2 hours.

..Bunting.. 07/13/2018

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

ATTN...WFO...GRB...LOT...MKX...DVN...ARX...

LAT...LON 42929122 43679052 44078924 44158865 44038789 43658774
42838777 42638787 42528815 42538850 41579029 41769112
42209149 42929122



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