

241 

WWUS20 KWNS 260100

SEL1

SPC WW 260100

NDZ000-260600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 551

NWS STORM PREDICTION CENTER NORMAN OK

800 PM CDT SAT JUN 25 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND NORTHEAST NORTH DAKOTA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 800 PM

UNTIL 100 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST

NORTHWEST OF HALLOCK MINNESOTA TO 60 MILES SOUTH SOUTHWEST OF

BISMARCK NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 550...



DISCUSSION...AN INITIAL CLUSTER OF STORMS IN N CENTRAL ND WILL

LIKELY PERSIST WITH A RISK FOR LARGE HAIL/DAMAGING WINDS FOR THE

NEXT FEW HOURS INTO NE ND...SUPPORTED BY EFFECTIVE BULK SHEAR NEAR

30 KT AND MLCAPE NEAR 2000 J/KG.  FARTHER SW ALONG THE COLD

FRONT...NEW STORMS ARE DEVELOPING INTO CENTRAL ND.  THIS CONVECTION

SHOULD INTENSIFY SOME THIS EVENING...WITH AN ATTENDANT RISK FOR

LARGE HAIL AND DAMAGING WINDS...IN A STORM ENVIRONMENT WITH SLIGHTLY

LARGER INSTABILITY AND VERTICAL SHEAR COMPARED TO NE ND.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27025.





...THOMPSON

