The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Click for Watch Status Reports
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 357
NWS Storm Prediction Center Norman OK
535 PM MDT Fri Jul 9 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest South Dakota
* Effective this Friday afternoon and evening from 535 PM until
1100 PM MDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...A small cluster with embedded supercells is expected to
move east-southeastward across northeast Wyoming and southwest South
Dakota this evening through early tonight. The strongest storms
will be capable of producing occasional large hail and damaging
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 25 miles west northwest
of Gillette WY to 40 miles south southeast of Rapid City SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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
OTHER WATCH INFORMATION...CONTINUE...WW 356...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector