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WWUS20 KWNS 042051

SEL8

SPC WW 042051

MNZ000-NDZ000-SDZ000-050500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 328

NWS Storm Prediction Center Norman OK

355 PM CDT Sat Jul 4 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western Minnesota

  Southeast North Dakota

  Northeast South Dakota



* Effective this Saturday afternoon from 355 PM until Midnight

  CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Storms will quickly intensify near an outflow boundary

near/north of the South Dakota/North Dakota border vicinity through

late afternoon and early evening. Ample instability and modest

deep-layer shear will support the possibility of a few supercells

capable of large hail. A tornado cannot be ruled out, particularly

near the outflow boundary. The potential for damaging winds may

increase this evening as storms increase in coverage and organize

into clusters.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 100 miles west

southwest of Jamestown ND to 40 miles southeast of Fargo ND. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU8).



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.



&&



AVIATION...A few severe thunderstorms with hail surface and aloft to

2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 550. Mean storm motion vector

27020.



...Guyer

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