SPC Severe Thunderstorm Watch 642



WW 642 SEVERE TSTM SD 102325Z – 110300Z

WW 0642 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 642
NWS Storm Prediction Center Norman OK
625 PM CDT Tue Sep 10 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Parts of southern South Dakota

* Effective this Tuesday evening from 625 PM until 1000 PM CDT.

* Primary threats include...
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter possible
  A tornado or two possible

SUMMARY...Clusters of storms will continue to spread eastward from
south central South Dakota, along the immediate cool side of a
surface front.  Large hail and damaging winds will be the main
threats, though an isolated tornado cannot be ruled out this
evening.

The severe thunderstorm watch area is approximately along and 30
statute miles north and south of a line from 30 miles south
southwest of Chamberlain SD to 15 miles south of Mitchell SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU2).

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 640...WW 641...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
27025.

...Thompson

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