SPC Severe Thunderstorm Watch 557



WW 557 SEVERE TSTM NE SD 070120Z – 070800Z

WW 0557 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 557
NWS Storm Prediction Center Norman OK
820 PM CDT Tue Aug 6 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Parts of north central and central Nebraska
  Parts of south central and southeast South Dakota

* Effective this Tuesday night and Wednesday morning from 820 PM
  until 300 AM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Clusters of severe storms, including some supercells, will
continue to spread south-southeastward from South Dakota into
Nebraska overnight, with additional storm development also possible.
 The storm environment will favor large hail and damaging gusts as
the primary severe threats through the early morning hours.

The severe thunderstorm watch area is approximately along and 55
statute miles east and west of a line from 45 miles north of
Chamberlain SD to 55 miles south southeast of Burwell NE. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 555...WW 556...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
32030.

...Thompson

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