WATCHES: Tornado Watch Number 217

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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