ZCZC SPCSWOMCD ALL
ACUS11 KWNS 232313 
SPC MCD 232313 
IAZ000-NEZ000-SDZ000-240045-

Mesoscale Discussion 1070
NWS Storm Prediction Center Norman OK
0613 PM CDT Wed Jun 23 2021

Areas affected...parts of central and eastern Nebraska and into far
southeastern South Dakota

Concerning...Severe Thunderstorm Watch 306...

Valid 232313Z - 240045Z

The severe weather threat for Severe Thunderstorm Watch 306
continues.

SUMMARY...Severe risk continues to increase locally over parts of
north-central Nebraska.  As convection shifts eastward -- spreading
out of the WW in the next 1-2 hours -- a new WW may be needed into
the northeastern Nebraska area.

DISCUSSION...Latest radar loop shows hints that storms may begin to
congeal across north-central Nebraska, as suggested by latest runs
of the HRRR and which seems reasonable given downstream instability
that is available.  As a south-southwesterly low-level jet develops
and then veers gradually through the evening, east-southeastward
propagation of the convection seems likely.

Presuming continued trends toward upscale growth, damaging wind
potential will likely become more widespread.  Otherwise, large hail
will remain possible, with baseball-sized hail reported earlier in
Keya Paha County.  As storms near the eastern edge of WW 306,
downstream watch issuance will likely be needed to encompass this
threat.

..Goss/Grams.. 06/23/2021

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

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

LAT...LON   42760076 42930042 43149865 43039712 42799634 41829591
            41279704 41189854 41319996 41950078 42760076 

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