513
WWUS20 KWNS 121905
SEL6
SPC WW 121905
SDZ000-WYZ000-130200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 576
NWS STORM PREDICTION CENTER NORMAN OK
105 PM MDT WED AUG 12 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN SOUTH DAKOTA
EXTREME NORTHEAST WYOMING
* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 105 PM
UNTIL 800 PM MDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75
MPH POSSIBLE
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3
INCHES IN DIAMETER POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...ISOLATED SUPERCELLS ARE EXPECTED TO MOVE GENERALLY
EASTWARD FROM WYOMING INTO SOUTH DAKOTA, WITH ADDITIONAL STORM
DEVELOPMENT POSSIBLE THROUGH THE AFTERNOON TOWARD NORTHWEST SOUTH
DAKOTA. ISOLATED VERY LARGE HAIL UP TO 3 INCHES IN DIAMETER WILL BE
A PRIMARY THREAT, THOUGH AN ISOLATED TORNADO WILL BE POSSIBLE NEAR
THE WYOMING/SOUTH DAKOTA BORDER. A GREATER THREAT FOR SEVERE
OUTFLOW GUSTS IS EXPECTED LATER THIS AFTERNOON/EVENING WITH ANY
STORM CLUSTERING.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 105 MILES NORTH OF RAPID
CITY SD TO 70 MILES SOUTH OF RAPID CITY SD. FOR A COMPLETE DEPICTION
OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU6).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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
TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 575...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR
29025.
...THOMPSON
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