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000 

WWUS20 KWNS 081957

SEL9

SPC WW 081957

MNZ000-NDZ000-090200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 569

NWS STORM PREDICTION CENTER NORMAN OK

255 PM CDT WED AUG 8 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHWEST MINNESOTA

       CENTRAL AND EASTERN NORTH DAKOTA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

900 PM 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 130

STATUTE MILES EAST AND WEST OF A LINE FROM 85 MILES NORTH

NORTHWEST OF JAMESTOWN NORTH DAKOTA TO 80 MILES SOUTH SOUTHWEST

OF JAMESTOWN NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 568...



DISCUSSION...STORMS ARE INCREASING ALONG ERN EDGE OF SATELLITE

INDICATED DRY SLOT OVER SOUTH CENTRAL ND...WITH ADDITIONAL STORMS

APPROACHING CENTRAL ND FROM THE WEST THAT ARE ASSOCIATED WITH THE

UPPER VORTICITY MAX.  MODERATELY STRONG WESTERLY FLOW ALOFT IS

CONTRIBUTING TO FAVORABLE DEEP LAYER SHEAR SUPPORTIVE OF SEVERE

STORMS.  ACTIVITY IS LIKELY TO PROGRESS EWD/ENEWD INTO THE EVENING

HOURS WITH PRIMARY THREAT FOR LARGE HAIL...ALTHOUGH DAMAGING WIND

GUSTS AND AN ISOLATED TORNADO MAY ALSO BE POSSIBLE.



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 450. MEAN STORM

MOTION VECTOR 26025.





...WEISS

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