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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 355
NWS Storm Prediction Center Norman OK
930 PM CDT Thu Jul 8 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and southeastern South Dakota
* Effective this Thursday night and Friday morning from 930 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...Supercells in northwestern South Dakota and southwestern
North Dakota could move into the western parts of the watch area in
central South Dakota before those storms weaken. Additional
elevated thunderstorms will likely form farther southeast into
southeastern South Dakota through the early overnight hours. The
strongest storms to the west will be capable of producing large hail
and damaging winds, while the elevated storms to the east will
primarily pose a threat for large hail.
The severe thunderstorm watch area is approximately along and 35
statute miles north and south of a line from 80 miles west northwest
of Pierre SD to 25 miles south southeast of Sioux Falls SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).
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
OTHER WATCH INFORMATION...CONTINUE...WW 350...WW 353...WW 354...
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