Severe Storm Outlook Narrative (AC)
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322
ACUS11 KWNS 202302
SWOMCD
SPC MCD 202301
OHZ000-MIZ000-INZ000-210000-

Mesoscale Discussion 0530
NWS Storm Prediction Center Norman OK
0601 PM CDT Thu Apr 20 2017

Areas affected...Eastern IN...Southeast MI...Northwest OH

Concerning...Severe Thunderstorm Watch 151...

Valid 202301Z - 210000Z

The severe weather threat for Severe Thunderstorm Watch 151
continues.

SUMMARY...Scattered thunderstorms, a few severe, will continue
across the southeastern half of WW151 this evening.

DISCUSSION...Considerable convective overturning has occurred across
much of the OH Valley this evening.  In the absence of significant
buoyancy, stronger low-level forcing along the cold front should
serve as the primary focus for most organized thunderstorms over the
next few hours.  With onset of diurnal cooling it appears the
greatest risk will be marginally severe hail and locally gusty
winds.

Just south of the watch over southern IN, a small cluster of
strong/severe thunderstorms has developed.  This activity has
evolved within slightly more unstable air mass where influence from
earlier convection was less disruptive.  Even so, marginally severe
hail and gusty winds should be the primary threats as this
convection spreads toward southwest OH.

..Darrow.. 04/20/2017

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

ATTN...WFO...CLE...ILN...DTX...IWX...GRR...IND...

LAT...LON   42368511 42368199 40348252 40348554 42368511




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