

471 

WWUS20 KWNS 112157

SEL5

SPC WW 112157

MTZ000-SDZ000-WYZ000-120500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 465

NWS STORM PREDICTION CENTER NORMAN OK

400 PM MDT SAT JUN 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST MONTANA

       WESTERN SOUTH DAKOTA

       NORTHEAST WYOMING



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 400 PM UNTIL

1100 PM MDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH NORTHWEST OF

BAKER MONTANA TO 80 MILES SOUTH OF RAPID CITY SOUTH DAKOTA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 462...WW 463...WW 464...



DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS

AFTERNOON AND EVENING ACROSS SOUTHEAST MT/NORTHEAST WY AND SPREAD

INTO THE WATCH AREA.  OTHER STORMS MAY FORM OVER THE BLACK HILLS OF

WESTERN SD.  STRONG EFFECTIVE SHEAR VALUES AND SUFFICIENT

INSTABILITY WILL POSE A RISK OF ISOLATED TORNADOES...ALONG WITH

LARGE HAIL 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

450. MEAN STORM MOTION VECTOR 26030.





...HART

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