Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 220554
SWOMCD
SPC MCD 220553
OHZ000-INZ000-220700-

Mesoscale Discussion 1391
NWS Storm Prediction Center Norman OK
1253 AM CDT Sat Jul 22 2017

Areas affected...Central Indiana

Concerning...Severe potential...Watch likely

Valid 220553Z - 220700Z

Probability of Watch Issuance...80 percent

SUMMARY...Bowing segment in northwest IN could persist for a few
hours while moving southeastward, with an attendant damaging-wind
threat.  A new severe thunderstorm watch may be needed soon
downstream into central IN.

DISCUSSION...A bowing segment is moving southeastward at about 45 kt
into northwest IN.  This convection will likely persist for a few
more hours as it moves along the immediate cool side of a
northwest-southeast outflow boundary across central IN.  A feed of
rich low-level moisture (mid 70s dewpoints) from the west will
maintain the convection as it forward propagates along the
boundary/buoyancy gradient in the zone of stronger storm-relative
inflow.  Given the organization of the convection in combination
with the moderate-strong buoyancy feed and modestly enhanced
vertical shear, the threat for a few damaging gusts could continue
for a few more hours.  As such, a new severe thunderstorm watch will
be proposed shortly.

..Thompson/Edwards.. 07/22/2017

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

ATTN...WFO...ILN...IWX...IND...

LAT...LON   40828621 40718577 40178489 39848480 39468497 39448561
            40058658 40478706 40608699 40808673 40828621




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