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WWUS20 KWNS 010324

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MNZ000-NDZ000-011100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 707

NWS STORM PREDICTION CENTER NORMAN OK

1025 PM CDT SUN JUL 31 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST MINNESOTA

       EASTERN NORTH DAKOTA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1025 PM UNTIL

600 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 85

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST

NORTHWEST OF JAMESTOWN NORTH DAKOTA TO 45 MILES NORTHEAST OF

DETROIT LAKES MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 706...



DISCUSSION...CLUSTER OF SEVERE STORMS APPROACHING BIS AREA WILL

LIKELY PERSIST AND CONTINUE MOVING NEWD...WITH A GRADUAL TURN MORE

TO THE ENE LATER TONIGHT.  THE CLUSTER IS BEING FED BY A RESERVOIR

OF STRONG INSTABILITY OVER SRN/CENTRAL ND...AND THIS AIR MASS WILL

SPREAD NEWD ABOVE THE SURFACE IN A STRENGTHENING WAA PATTERN

OVERNIGHT.  OTHER MORE ISOLATED STORMS HAVE ALSO FORMED CLOSE TO THE

SURFACE FRONT IN SE ND.  DAMAGING WINDS AND LARGE HAIL WILL BE THE

MAIN SEVERE THREATS IN EITHER CASE.



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 600. MEAN STORM

MOTION VECTOR 25030.





...THOMPSON

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