ZCZC SPCSWOMCD ALL
ACUS11 KWNS 210320 
SPC MCD 210320 
SDZ000-NDZ000-NEZ000-210515-

Mesoscale Discussion 1994
NWS Storm Prediction Center Norman OK
1020 PM CDT Fri Sep 20 2019

Areas affected...northern parts of the Nebraska Panhandle into
western and central South Dakota

Concerning...Severe Thunderstorm Watch 655...

Valid 210320Z - 210515Z

The severe weather threat for Severe Thunderstorm Watch 655
continues.

SUMMARY...Local severe risk continues with scattered, vigorous
storms over portions of WW 655.

DISCUSSION...latest radar loop shows scattered strong/locally severe
storms moving northeast across western South Dakota, and adjacent
portions of the Nebraska Panhandle.  While cool/stable air continues
to surge southward across eastern Wyoming, a relatively
moist/unstable airmass persists across much of central South Dakota,
downstream of the ongoing storms.  As such, local severe risk --
mainly in the form of hail -- will likely continue over the next few
hours.

With an airmass largely uncontaminated by prior convection
continuing across north-central South Dakota, northeast of WW 665,
some severe risk could spread out of the WW and into these areas
over the next couple of hours.  Though this region was previously
included within now-expired WW 654, expansion of ww 655 into these
areas may be required, if convection -- and associated severe risk
-- increases in conjunction with the strengthening low-level jet.

..Goss.. 09/21/2019

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

ATTN...WFO...FSD...ABR...BIS...LBF...UNR...CYS...

LAT...LON   42230098 42080194 42610327 42890316 43720321 44220348
            44850316 45730198 45989966 45859833 44589858 43179951
            42230098 

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