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WWUS20 KWNS 170114

SEL6

SPC WW 170114

NEZ000-SDZ000-170800-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 506

NWS Storm Prediction Center Norman OK

815 PM CDT Thu Sep 16 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central and western Nebraska

  Southern South Dakota



* Effective this Thursday night and Friday morning from 815 PM

  until 300 AM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Growing clusters of thunderstorms on either side of a

slow-moving cold front should pose a severe hail/wind threat, as

they access a strengthening low-level jet, and move east-

northeastward across the watch area tonight.



The severe thunderstorm watch area is approximately along and 90

statute miles north and south of a line from 30 miles south

southwest of Mullen NE to 30 miles northeast of Oneill NE. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU6).



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 504...WW 505...



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

24030.



...Edwards

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