MD 1409 CONCERNING SEVERE THUNDERSTORM WATCH 364… FOR PORTIONS OF IOWA…FAR NORTHERN MISSOURI…AND FAR NORTHWESTERN ILLINOIS
Mesoscale Discussion 1409
NWS Storm Prediction Center Norman OK
1027 PM CDT Sat Sep 01 2018
Areas affected...Portions of Iowa...far northern Missouri...and far
northwestern Illinois
Concerning...Severe Thunderstorm Watch 364...
Valid 020327Z - 020430Z
The severe weather threat for Severe Thunderstorm Watch 364
continues.
SUMMARY...The severe threat continues across WW 364.
DISCUSSION...Widespread strong to marginally severe convection
continues across the WW at this time, although the combination of
widespread convective overturning and low-level
cooling/stabilization has tempered the severe threat somewhat.
Nevertheless, newer updrafts in areas that have not been
convectively overturned will have access to steep mid-level lapse
rates and moderate to strong instability, supporting an isolated
hail and damaging wind threat for the next couple of hours or so.
Additionally, forward-propagating linear segments entering
southwestern Iowa and vicinity will pose a threat for wind gusts
approaching severe thresholds. Areas west of these linear segments
will have a decreased severe threat, and cancellations for portions
of WW 364 may be needed behind this line.
..Cook.. 09/02/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LOT...ILX...DVN...DMX...EAX...OAX...TOP...
LAT...LON 41619539 42079493 42339269 42299109 42239015 42048972
41718956 41238988 40939067 40569217 40289384 39989499
40019585 40559598 41039591 41619539
from SPC Mesoscale Discussions http://bit.ly/2PS8ys1
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