|Mesoscale Discussion 752|
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Mesoscale Discussion 0752
NWS Storm Prediction Center Norman OK
0605 PM CDT Wed May 17 2017
Areas affected...eastern and northeastern IA...southeastern
Concerning...Tornado Watch 233...234...
Valid 172305Z - 180000Z
The severe weather threat for Tornado Watch 233, 234 continues.
SUMMARY...Scattered to widespread severe gusts are forecast with a
bowing thunderstorm band over eastern portions of IA and this
feature will move into southeastern MN and southwest WI this
DISCUSSION...A mature and well-developed QLCS arcs from
north-central IA into east-central and southeastern IA and it is
moving north-northeast at 50-55 kt. The convective band is on the
leading edge of a mid-level dryslot punching northeastward into the
middle-upper MS Valley in the base of a migratory shortwave trough.
Surface temperatures ahead of the squall line have warmed into the
upper 70s to around 80 degrees F over much of the discussion area.
Marshalltown IA (KMIW) recorded a measured gust of 60-kt at 2212Z
and Waterloo, IA (KALO) more recently observed a 61-kt gust at
2253Z. Expecting the QLCS to continue to result in scattered to
widespread severe gusts (60-75 kt). Single site radar imagery has
also indicated the development of a couple of substantial
mesovortices in the squall line. A couple of short-track weak
tornadoes are possible with any sustained/stronger mesovortex which
appear to be most likely over northeast IA into adjacent portions of
MN/WI over the next 1-2 hours.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 43059352 43699285 43909169 43059045 41219078 40709211
41719186 42879259 43059352
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