

702 

WWUS20 KWNS 162048

SEL2

SPC WW 162048

NDZ000-NEZ000-SDZ000-WYZ000-170600-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 512

NWS Storm Prediction Center Norman OK

250 PM MDT Tue Jul 16 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southwest North Dakota

  The western Nebraska Panhandle

  Western South Dakota

  Eastern Wyoming



* Effective this Tuesday afternoon from 250 PM until Midnight

  MDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2.5 inches in diameter possible

  Scattered damaging wind gusts to 70 mph likely

  A tornado or two possible



SUMMARY...Thunderstorm development is expected in multiple areas

from eastern Wyoming across the Black Hills into southwest North

Dakota this afternoon into this evening.  The initial storms could

be supercells capable of producing large hail, damaging winds, and

perhaps an isolated tornado from the Black Hills northward.  Later

this evening into tonight, storms could grow upscale into one or

more clusters and move into South Dakota, with an increasing threat

for damaging winds.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 30 miles north of Lemmon

SD to 25 miles south southwest of Torrington WY. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU2).



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 511...



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 500. Mean storm motion vector

27025.



...Thompson

