

000 

WWUS20 KWNS 070155

SEL6

SPC WW 070155

MNZ000-NDZ000-SDZ000-070900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 356

NWS STORM PREDICTION CENTER NORMAN OK

850 PM CDT WED JUN 6 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN MINNESOTA

       EASTERN NORTH DAKOTA

       NORTHEAST SOUTH DAKOTA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 850 PM

UNTIL 400 AM 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 40 MILES SOUTHWEST OF

WATERTOWN SOUTH DAKOTA TO 65 MILES NORTH OF FARGO NORTH DAKOTA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 353...WW 354...WW 355...



DISCUSSION...SQLN WITH EMBEDDED SUSTAINED STORMS/POSSIBLE SUPERCELLS

NOW OVER N CNTRL SD EXPECTED TO CONTINUE NE INTO WW AREA...WITH AN

ATTENDANT THREAT FOR HIGH WIND/HAIL AND POSSIBLY A TORNADO.  OTHERS

STORMS MAY MOVE INTO SRN PART OF WW FROM ACTIVITY NOW FORMING INVOF

DRY LINE/OUTFLOW BOUNDARY INTERSECTION IN N CNTRL/NE NEB.  IN

ADDITION  ...STORMS MAY FORM OVER NRN PART OF WW AS STRENGTHENING

LLJ ENHANCES WAA INVOF DIFFUSE WARM FRONT.  BACKED LOW LEVEL FLOW NE

OF SEASONABLY STRONG NRN SD SFC LOW...STRENGTH OF WIND FIELD/FORCING

DOWNSTREAM FROM APPROACHING RCKYS UPR TROUGH...AND DEGREE OF

INSTABILITY SUGGEST POTENTIAL FOR SOME LOW LEVEL STORM

ROTATION...DESPITE LIKELY QUASI-LINEAR DOMINANT CONVECTIVE MODE.



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

500. MEAN STORM MOTION VECTOR 24030.





...CORFIDI

