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ACUS11 KWNS 282307
SWOMCD
SPC MCD 282307
IAZ000-ILZ000-290000-

Mesoscale Discussion 1383
NWS Storm Prediction Center Norman OK
0607 PM CDT Tue Aug 28 2018

Areas affected...East Central Iowa from Johnson through Scott and
Clinton Counties.

Concerning...Severe Thunderstorm Watch 357...

Valid 282307Z - 290000Z

The severe weather threat for Severe Thunderstorm Watch 357
continues.

SUMMARY...A narrow corridor of strong damaging winds and potential
line embedded tornadoes exists for the next hour across Johnson and
Washington Counties in Iowa.

DISCUSSION...A strong bowing segment has developed in east central
Iowa where the line has interacted with the outflow boundary from
earlier convection and is moving toward Iowa City. A sharp
reflectivity gradient and a developing rear inflow jet suggest this
bowing segment may be producing significantly strong wind gusts.
Current lowest tilt wind speeds in the apex of this bow are measured
around 85 knots per both the DMX and DVN 88D. These wind speeds are
being measured around 6000 feet in the storm, but still represent
the area of greatest wind speed. Wind gusts were measured at 68 mph
south of the apex of this bow where measured wind speeds are much
less and the reflectivity structure is not as organized. Therefore,
would expect that surface wind speeds may be in excess of 80 mph on
the apex of this bow. In addition, a large mesovortex has formed on
the northern edge of this bowing segment. This vortex will lead to
the possibility of a narrow swath of even stronger winds and even a
few tornadoes. Significant wind damage may be possible across
Johnson County, Iowa and could persist as far east as Quad Cities.

..Bentley.. 08/28/2018

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

ATTN...WFO...DVN...DMX...

LAT...LON 41839207 41949146 41899082 41729061 41549066 41369100
41229160 41219201 41279224 41479234 41839207



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