[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 312247
SWOMCD
SPC MCD 312247
ALZ000-TNZ000-MSZ000-010015-

Mesoscale Discussion 1608
NWS Storm Prediction Center Norman OK
0547 PM CDT Thu Aug 31 2017

Areas affected...Mid South

Concerning...Tornado Watch 476...

Valid 312247Z - 010015Z

The severe weather threat for Tornado Watch 476 continues.

SUMMARY...Tornado threat continues across WW476, especially across
northern and central Alabama.

DISCUSSION...Remnants of Harvey continue to drift slowly northeast
with the center of circulation near GWO over northern MS. Several
long-lived supercells have been noted this afternoon ahead of this
feature with the primary corridor for the most robust convection
across northwest AL. This corridor has been most active primarily
due to more favorable thermodynamics where surface temperatures have
warmed into the lower 80s and surface-3km lapse rates are on the
order of 6.5 C/km. Latest thinking is supercell structures, and
attendant tornado threat, will continue to favor this zone until
boundary-layer cooling commences and buoyancy begins to decrease.

..Darrow.. 08/31/2017

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

ATTN...WFO...OHX...BMX...HUN...MOB...MEG...JAN...

LAT...LON   34549042 35948859 33348606 31968782 34549042
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