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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 479
NWS Storm Prediction Center Norman OK
955 PM CDT Mon Aug 30 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
North-central and northeastern Nebraska
Western through southern South Dakota
* Effective this Monday night and Tuesday morning from 955 PM
until 500 AM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2.5
inches in diameter likely
Scattered damaging winds likely with isolated significant gusts
to 80 mph possible
SUMMARY...Several ongoing strong to severe thunderstorms --
including a few supercells -- are expected to aggregate with newer
convection tonight across southern SD and northern NE. Until that
occurs, large/damaging hail is possible from that activity, as well
as more-isolated convection in northern NE and southeastern SD. A
thunderstorm complex is forecast to evolve and move southeastward on
either side of a stationary front. That activity would increase the
severe-wind threat into southern SD and north-central/northeastern
The severe thunderstorm watch area is approximately along and 60
statute miles either side of a line from 45 miles north northwest of
Philip SD to 55 miles south of Yankton SD. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
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 477...WW 478...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector