SPC Tornado Watch 640

WW 640 TORNADO NE SD WY 101950Z – 110300Z

WW 0640 Image

Tornado Watch Number 640
NWS Storm Prediction Center Norman OK
150 PM MDT Tue Sep 10 2019

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern Nebraska
  Southern South Dakota
  Eastern Wyoming

* Effective this Tuesday afternoon and evening from 150 PM until
  900 PM MDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered large hail likely with isolated very large hail events
    to 3 inches in diameter possible
  Scattered damaging wind gusts to 70 mph likely

SUMMARY...Thunderstorms will intensify this afternoon over eastern
Wyoming, and along a boundary over northern Nebraska.  These storms
will affect the watch area through the evening, posing a risk of
large hail, damaging wind gusts, and a few tornadoes.

The tornado watch area is approximately along and 60 statute miles
north and south of a line from 45 miles northwest of Douglas WY to
30 miles northeast of Ainsworth NE. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU0).


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 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 26030.


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