Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 220900
SWOMCD
SPC MCD 220900
OHZ000-INZ000-221030-

Mesoscale Discussion 1392
NWS Storm Prediction Center Norman OK
0400 AM CDT Sat Jul 22 2017

Areas affected...Southwest IN and southeast OH

Concerning...Severe Thunderstorm Watch 431...

Valid 220900Z - 221030Z

The severe weather threat for Severe Thunderstorm Watch 431
continues.

SUMMARY...Convective line will pose a marginal damaging-wind threat
for another 1-2 hours, but a downstream watch into OH is not
anticipated.

DISCUSSION...Southeastward motion of the line of storms across IN
has slowed to 30-35 kt, compared to the earlier 45 kt with a bowing
segment.  The stronger storms persist on the immediate cool side of
a remnant outflow boundary from earlier convection, though this
outflow is becoming more diffuse in time.  Also, the storms will
begin to move away from the primary buoyancy source region across
southern IL/IN, and vertical shear weakens gradually with
southeastward extent.  Isolated strong/damaging outflow gusts may
occur in the short term given modest cold-pool momentum and the
potential for strong localized downdrafts with precipitation
loading.  However, this threat will diminish slowly as the
convection moves into OH, and present indications are that a new
downstream watch is not necessary.

..Thompson.. 07/22/2017

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

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

LAT...LON   39388396 39158434 39158472 39318518 39568547 39768557
            39838544 40128507 40348483 40348450 40228409 39938379
            39388396



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