

291 

WWUS20 KWNS 022030

SEL8

SPC WW 022030

NDZ000-SDZ000-030500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 478

NWS Storm Prediction Center Norman OK

330 PM CDT Tue Jul 2 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern North Dakota

  North-central South Dakota



* Effective this Tuesday afternoon from 330 PM until Midnight

  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...Two distinct severe weather episodes are expected this

evening. First, a couple discrete supercells should develop along a

cold front across far southern North Dakota. These will pose a risk

for large hail and a brief tornado, especially across southwest

North Dakota. Some of this activity may spread into north-central

South Dakota. The second episode is a cluster that should progress

east from the Montana/Wyoming border region, with severe wind gusts

as the primary hazard.



The severe thunderstorm watch area is approximately along and 65

statute miles north and south of a line from 50 miles west of Lemmon

SD to 40 miles south southeast of Jamestown 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 477...



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 500. Mean storm motion vector

25030.



...Grams

