080
WWUS20 KWNS 172058
SEL1
SPC WW 172058
SDZ000-180400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 591
NWS STORM PREDICTION CENTER NORMAN OK
300 PM MDT MON AUG 17 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH DAKOTA
* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM MDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80
MPH POSSIBLE
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5
INCHES IN DIAMETER POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...SEVERAL CORRIDORS OF SEVERE STORM DEVELOPMENT ARE EXPECTED
THROUGH LATE AFTERNOON/EARLY EVENING, INCLUDING A
SOUTHEASTWARD-SPREAD OF STORMS INTO CENTRAL SOUTH DAKOTA, WITH
ADDITIONAL DEVELOPMENT EXPECTED ACROSS FAR EASTERN WYOMING AND THE
BLACK HILLS VICINITY. SUPERCELLS ARE POSSIBLE, AND ONE OR MORE
CLUSTERS COULD EVOLVE BY EVENING WITH HEIGHTENED DAMAGING WIND
POTENTIAL.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST SOUTHWEST
OF RAPID CITY SD TO 35 MILES SOUTH SOUTHEAST OF ABERDEEN SD. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
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 590...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR
29025.
...GUYER
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