Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 200306
SWOMCD
SPC MCD 200306
ILZ000-WIZ000-IAZ000-200400-

Mesoscale Discussion 0524
NWS Storm Prediction Center Norman OK
1006 PM CDT Wed Apr 19 2017

Areas affected...Iowa

Concerning...Severe Thunderstorm Watch 150...

Valid 200306Z - 200400Z

The severe weather threat for Severe Thunderstorm Watch 150
continues.

SUMMARY...Marginally severe hail and gusty winds remain possible
with squall line as it progresses across western/northern portions
of WW150.

DISCUSSION...Frontal convection has gradually become less organized
over the last hour or so, but a robust squall line continues its
eastward movement across WW150 at roughly 35kt.  Air mass ahead of
this activity over central IA is modestly unstable but convection
appears to be slightly elevated in nature and overall intensity has
waned somewhat.  Thunderstorms have struggled to produce large hail
this evening and latest MRMS data suggests hail is mostly
sub-severe.  Current thinking is gusty winds, along with marginally
severe hail, are the primary threats with this frontal squall line.

..Darrow.. 04/20/2017

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

ATTN...WFO...MKX...DVN...ARX...DMX...

LAT...LON   41149441 42769344 42758989 41159095 41149441




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