SPC MD 1126

MD 1126 CONCERNING SEVERE THUNDERSTORM WATCH 334... FOR WESTERN THROUGH CENTRAL SOUTH DAKOTA

Mesoscale Discussion 1126
NWS Storm Prediction Center Norman OK
0907 PM CDT Mon Jul 06 2020

Areas affected...western through central South Dakota

Concerning...Severe Thunderstorm Watch 334...

Valid 070207Z - 070330Z

The severe weather threat for Severe Thunderstorm Watch 334
continues.

SUMMARY...Threat for damaging wind and large hail will persist
through about 04Z across a portion of western South Dakota. Farther
east additional storms may develop, and also the line of storms will
begin to move east of WW 334 after 03Z. While a downstream WW into
central SD is uncertain, issuance will ultimately depend on
convective trends.

DISCUSSION...As of mid evening, a line of storms continues moving
through western SD at 30-35 kt. A comma head structure was observed
on the northern end of the line, while a supercell producing large
hail remains on the southern end, but storms in between are
beginning to struggle. While the downstream atmosphere remains
moderately unstable, surface-based convective inhibition is
increasing which will serve as a liming factor. Nevertheless, a
nocturnal low-level jet is developing, which along with the
organized structures embedded within the line, may help to sustain
storms into central SD. Other warm advection storms may also develop
ahead of the line. Given competing forces for storm maintenance, the
longer-term severe threat remains uncertain, but storms will
continue to pose a risk for damaging wind and large hail next couple
hours.

..Dial.. 07/07/2020

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

ATTN...WFO...FSD...ABR...UNR...

LAT...LON   44220274 44690225 45150200 44990067 44589898 43889922
            43550018 43160160 43170257 43620305 44220274 

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