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094 

WWUS20 KWNS 251955

SEL7

SPC WW 251955

MTZ000-NDZ000-SDZ000-WYZ000-260400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 217

NWS STORM PREDICTION CENTER NORMAN OK

155 PM MDT SAT MAY 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  SOUTHEAST MONTANA

  SOUTHWEST NORTH DAKOTA

  WESTERN AND CENTRAL SOUTH DAKOTA

  NORTHEAST WYOMING



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 155 PM UNTIL

  1000 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER

    POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 115 STATUTE

MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTH SOUTHEAST OF

RAPID CITY SOUTH DAKOTA TO 45 MILES NORTH NORTHEAST OF BAKER

MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



&&



DISCUSSION...TSTMS IN PROGRESS OVER SWRN ND/NWRN SD SHOULD CONTINUE

TO INTENSIFY THIS AFTERNOON WITH ADDITIONAL SURFACE-BASED STORMS

DEVELOPING OVER THE BLACK HILLS AND HIGH TERRAIN OF SERN MT.  LOCAL

ENVIRONMENT IS CHARACTERIZED BY STEEP LAPSE RATES...MODERATE

INSTABILITY...AND VERTICALLY VEERING WIND PROFILES WITH 40-50 KT OF

DEEP-LAYER SHEAR.  AS SUCH...THE POTENTIAL WILL EXIST FOR DISCRETE

SUPERCELLS AND BOWING STRUCTURES WITH A RISK FOR SIGNIFICANT

HAIL...A FEW TORNADOES...AND DAMAGING WINDS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 26020.





...MEAD

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