

201 

WWUS20 KWNS 112029

SEL6

SPC WW 112029

COZ000-KSZ000-NEZ000-WYZ000-120400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 646

NWS Storm Prediction Center Norman OK

230 PM MDT Wed Sep 11 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeast Colorado

  Northwest Kansas

  Western and Central Nebraska

  Southeast Wyoming



* Effective this Wednesday afternoon and evening from 230 PM

  until 1000 PM MDT.



* Primary threats include...

  Widespread large hail and isolated very large hail events to 3

    inches in diameter likely

  Scattered damaging wind gusts to 70 mph likely

  A tornado or two possible



SUMMARY...Thunderstorms are expected to rapidly develop this

afternoon and overspread much of the watch area this afternoon and

early evening.  Supercells capable of large, damaging hail are the

main concern.  However, an isolated tornado or two cannot be ruled

out.



The severe thunderstorm watch area is approximately along and 95

statute miles north and south of a line from 25 miles east of North

Platte NE to 30 miles north of Cheyenne WY. 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 645...



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

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

few cumulonimbi with maximum tops to 500. Mean storm motion vector

27030.



...Hart

