Subj : MESO: Mesoscale Discussion 1611
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Tue Jul 18 2023 04:42:53

ACUS11 KWNS 180442
SWOMCD
SPC MCD 180442=20
NEZ000-SDZ000-180645-

Mesoscale Discussion 1611
NWS Storm Prediction Center Norman OK
1142 PM CDT Mon Jul 17 2023

Areas affected...Extreme southwest SD into western/central NE

Concerning...Severe Thunderstorm Watch 508...

Valid 180442Z - 180645Z

The severe weather threat for Severe Thunderstorm Watch 508
continues.

SUMMARY...Some severe threat could spread southeastward overnight.
Downstream watch issuance is possible.

DISCUSSION...An earlier supercell that produced very large hail
across southwest SD has weakened, but an arc of convection in
advance of this weakening cell is gradually intensifying across
parts of west-central NE. A modest low-level jet may help to
maintain convection as it spreads southeastward into central NE
overnight.=20

The evolution of storms and any attendant severe potential remains
uncertain overnight. Some guidance suggests the potential for
organized upscale growth overnight, as convection moves
southeastward near the MUCAPE and 850 mb moisture gradient. However,
the extent of moisture return and destabilization in advance of the
ongoing convection remains uncertain, and convection is likely to
remain somewhat elevated within an environment of stout MLCINH. As a
result, even if there is an uptick in storm intensity and
organization, the severe-wind threat could be somewhat limited. If
storms are able to propagate or develop into a more favorably
unstable environment across south-central/southeast NE, then a more
substantial wind threat could develop.=20

Given the uncertainties described above, the need for downstream
watch issuance in the short term remains uncertain, but remains
possible if a notable uptick in storm coverage/intensity occurs
overnight.

...Dean/Edwards.. 07/18/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!_5NRIdd9tkW2TWWkzmkPImYLBrx7h6IL3noTt82tKGMj1sJzTaWqJ6C4kUZzCMP75eyvTKlLT=
cevlQQD16nwK8NJUkY$  for graphic product...

ATTN...WFO...OAX...GID...LBF...UNR...

LAT...LON   43160265 43640213 43060063 42149864 41759758 41339704
            40809692 40499709 40309786 40399975 40670097 40930144
            41770103 42250110 42480153 42650216 43160265=20


=3D =3D =3D
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