SPC Tornado Watch 318



WW 318 TORNADO MT ND SD WY 292155Z – 300600Z

WW 0318 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 318
NWS Storm Prediction Center Norman OK
355 PM MDT Mon Jun 29 2020

The NWS Storm Prediction Center has issued a

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

* Effective this Monday afternoon from 355 PM until Midnight 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 possible

SUMMARY...Supercells are expected to develop especially across
eastern Montana/western North Dakota through late afternoon/early
evening, especially in vicinity of a surface low and warm front
where the large hail and tornado risk should be maximized. Other
somewhat higher based storms including supercells are expected
farther south across northeast Wyoming and western South Dakota.

The tornado watch area is approximately along and 90 statute miles
east and west of a line from 60 miles north of Williston ND to 50
miles east southeast of Gillette WY. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 550. Mean
storm motion vector 21020.

...Guyer

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