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URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 320
NWS Storm Prediction Center Norman OK
535 PM MDT Mon Jun 12 2017
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Western and southern South Dakota
* Effective this Monday afternoon and Tuesday morning from 535 PM
until 200 AM MDT.
* Primary threats include...
A few tornadoes possible
Scattered damaging winds and isolated significant gusts to 80
Scattered large hail and isolated very large hail events to 4
inches in diameter possible
SUMMARY...Supercells should move into the watch area from the
southwest, offering a threat for tornadoes and large to giant hail.
Activity should evolve into one or two complexes of storms with an
increasing risk of severe wind later this evening into tonight,
across the Badlands/Black Hills region and points northeast from
The tornado watch area is approximately along and 100 statute miles
east and west of a line from 90 miles northwest of Rapid City SD to
55 miles southwest of Valentine 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.
OTHER WATCH INFORMATION...CONTINUE...WW 316...WW 317...WW
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 4 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 22035.