SPC Tornado Watch 571

WW 571 TORNADO MT SD WY 112000Z – 120300Z

WW 0571 Image

Tornado Watch Number 571
NWS Storm Prediction Center Norman OK
200 PM MDT Sun Aug 11 2019

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Southern Montana
  Western South Dakota
  Northeast Wyoming

* Effective this Sunday afternoon and evening from 200 PM until
  900 PM MDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging winds and isolated significant gusts to 80
    mph possible
  Scattered large hail and isolated very large hail events to 3
    inches in diameter possible

SUMMARY...Multiple discrete supercells will progress east-northeast
from northeast Wyoming and south-central Montana. Large hail and a
couple tornadoes should be the primary threat during the first few
hours. Severe wind gust potential will increase later into the
evening as cells likely consolidate into one or more clusters,
especially across southern Montana.

The tornado watch area is approximately along and 85 statute miles
north and south of a line from 20 miles west northwest of Billings
MT to 50 miles northeast of Rapid City SD. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS


REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.



AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 24030.


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