

000 

WWUS20 KWNS 071612

SEL7

SPC WW 071612

MNZ000-NDZ000-SDZ000-072300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 357

NWS STORM PREDICTION CENTER NORMAN OK

1110 AM CDT THU JUN 7 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF NORTHERN AND PARTS OF CENTRAL MINNESOTA

       PARTS OF EASTERN NORTH DAKOTA

       NORTHEASTERN SOUTH DAKOTA



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1110 AM UNTIL

600 PM CDT.



TORNADOES...HAIL TO 2 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 NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH OF ABERDEEN

SOUTH DAKOTA TO 65 MILES SOUTH SOUTHEAST OF INTERNATIONAL FALLS

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...DEEP SURFACE LOW MOVING INTO NWRN MN WITH SURFACE

BOUNDARY EXTENDING NORTHERN AND  SERN ND INTO NRN MN.  AIR MASS HAS

BECOME MODERATELY UNSTABLE SOUTH OF BOUNDARY WITH HEATING AND

STEEPENING LAPSE RATES.  GIVEN THE STRENGTH OF SURFACE AND UPPER

SYSTEM SUPERCELLS ARE EXPECTED TO DEVELOP AHEAD OF LOW VICINITY

BOUNDARY.  IN ADDITION TO LARGE HAIL TORNADOES WILL BE POSSIBLE WITH

ANY SUPERCELL.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 24030.





...HALES

