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612 

WWUS20 KWNS 161905

SEL4

SPC WW 161905

NDZ000-SDZ000-170100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 434

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT TUE JUN 16 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN NORTH DAKOTA

       PARTS OF NORTHERN SOUTH DAKOTA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 1.5 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 10 MILES NORTHEAST OF BISMARCK

NORTH DAKOTA TO 50 MILES WEST SOUTHWEST OF WATERTOWN SOUTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 432...WW 433...



DISCUSSION...SUPERCELLS ARE DEVELOPING IN CYCLONIC CIRCULATION

AROUND UPPER LOW LOCATED W OF BIS.  WITH MLCAPES TO 1000 J/KG AND

VEERING SHEAR PROFILES...POTENTIAL WILL CONTINUE FOR SUPERCELLS

INCLUDING LARGE HAIL AND TORNADOES THRU THE AFTERNOON AS ACTIVITY

SHIFTS SLOWLY N AND NE THRU THE WATCH



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

450. MEAN STORM MOTION VECTOR 18025.





...HALES

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