|Mesoscale Discussion 1002|
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Mesoscale Discussion 1002
NWS Storm Prediction Center Norman OK
0638 PM CDT Mon Jun 12 2017
Areas affected...Portions of central...southern and eastern WI
Concerning...Severe Thunderstorm Watch 316...319...
Valid 122338Z - 130145Z
The severe weather threat for Severe Thunderstorm Watch 316, 319
SUMMARY...Severe threat for damaging winds and hail persists across
WW 319 this evening, while these threats have moved east of WW 316
(allowing this latter watch to be canceled early).
DISCUSSION...Mosaic radar imagery showed an ongoing bow advancing to
the east at 35-40 kt across south-central toward eastern WI, with
the bow currently extending from western Waupaca County to Waushara
and Green Lake Counties at the bow apex to Sauk County. From the
apex of the bow, a surface boundary extended eastward to Sheboygan
County and across the middle portion of Lake Michigan. The
environment downstream from the bow remains moderately unstable with
effective bulk shear of 40-50 kt oriented parallel to the surface
boundary. These factors suggest a continued forward propagation of
the bow with damaging winds being the primary threat along the bow
path. Meanwhile, additional strong to severe storm development
remains possible with northward extent (across the WI counties of
Marathon to Oconto) where sufficient instability and strong bulk
shear favor storm organization with a hail and damaging wind threat.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 42729057 43139011 43908925 44958975 45078953 45308845
44998777 44688680 43418724 42478698 42489023 42729057
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