

000 

WWUS20 KWNS 290555

SEL1

SPC WW 290555

MNZ000-291300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 771

NWS STORM PREDICTION CENTER NORMAN OK

1255 AM CDT TUE JUL 29 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN MINNESOTA



EFFECTIVE THIS TUESDAY MORNING FROM 1255 AM UNTIL 800 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTHEAST OF

ORTONVILLE MINNESOTA TO 45 MILES WEST NORTHWEST OF INTERNATIONAL

FALLS MINNESOTA.  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 769...WW 770...



DISCUSSION...THUNDERSTORMS...MOSTLY ELEVATED...WILL CONTINUE EWD IN

THE FORM OF ONE OR MORE CLUSTERS/MCSS OVERNIGHT AHEAD OF STRONG

MID/UPPER LEVEL TROUGH MOVING ACROSS MANITOBA/ND.  FEED OF VERY

UNSTABLE AIR OUT OF SD/SRN MN AND EFFECTIVE SHEAR FROM 35-45 KT WILL

LIKELY SUSTAIN THREATS OF LARGE HAIL WITH ELEVATED SUPERCELLS.  AS

COLD POOLS BECOME ESTABLISHED...SMALL BOWING SEGMENTS AND ISOLATED

DAMAGING WIND THREAT WILL ALSO EXIST.



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 25025.





...EVANS

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