Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 260250
SWOMCD
SPC MCD 260249
NEZ000-SDZ000-WYZ000-260445-

Mesoscale Discussion 1860
NWS Storm Prediction Center Norman OK
0949 PM CDT Sun Aug 25 2019

Areas affected...parts of southern South Dakota...and adjacent
northern Nebraska

Concerning...Severe Thunderstorm Watch 620...

Valid 260249Z - 260445Z

The severe weather threat for Severe Thunderstorm Watch 620
continues.

SUMMARY...Some severe risk continues across portions of South
Dakota, in and near WW 620.  With storms -- and possibly some severe
risk -- likely to spread southeastward into northern Nebraska with
time, some need for a new WW south of the existing watch could
arise.

DISCUSSION...Latest radar loop shows a band of storms -- with
embedded stronger cells -- crossing eastern North Dakota and central
South Dakota, through remaining portions of WW 619.  These storms
are gradually moving into a less unstable environment with eastward
extent, and should gradually diminish.  Meanwhile, a fast-moving
cluster of cells continues moving across southwest South Dakota, and
is likely producing strong wind gusts and possibly hail.

As these storms continue moving southeastward and encounter a more
unstable airmass over northern parts of the Nebraska Panhandle, some
expansion/intensification of this convection is expected.
Progression of these storms south of WW 620 into the next hour or so
may require new WW issuance across parts of Nebraska.

..Goss.. 08/26/2019

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

ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...CYS...

LAT...LON   42600398 43540406 44200390 44050230 44399989 42959765
            41809759 41479854 41660120 42100276 42600398



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