

000 

WWUS20 KWNS 222150

SEL6

SPC WW 222150

MNZ000-WIZ000-LSZ000-230400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 856

NWS STORM PREDICTION CENTER NORMAN OK

450 PM CDT FRI AUG 22 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST MINNESOTA

       FAR NORTHWEST WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 450 PM UNTIL

1100 PM CDT.



HAIL TO 1.5 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES EAST

SOUTHEAST OF BRAINERD MINNESOTA TO 40 MILES NORTH NORTHWEST OF

ELY MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 855...



DISCUSSION...SEVERE THUNDERSTORMS ARE EXPECTED TO INCREASE ALONG

STRONG SURFACE COLD FRONT...AHEAD OF SEASONABLY STRONG UPPER SYSTEM

NOW MOVING TOWARDS THE REGION.  AIR MASS IS MODERATELY UNSTABLE AND

WEAKLY CAPPED...WITH SUFFICIENT SHEAR FOR SUPERCELLS AND SMALL

BOWING SEGMENTS.  LARGE HAIL AND DAMAGING WINDS WILL BE PRIMARY

SEVERE THREATS...ALTHOUGH SHEAR IS QUITE STRONG AND MAY SUPPORT LOW

LEVEL ROTATION WITH THE STRONGER CORES.



AVIATION...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 400. MEAN STORM

MOTION VECTOR 24035.





...EVANS

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