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198 

WWUS20 KWNS 130632

SEL7

SPC WW 130632

NDZ000-131100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 607

NWS STORM PREDICTION CENTER NORMAN OK

135 AM CDT FRI AUG 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN NORTH DAKOTA



EFFECTIVE THIS FRIDAY MORNING FROM 135 AM UNTIL 600 AM CDT.



HAIL TO 1 INCH 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 45

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST

NORTHWEST OF GRAND FORKS NORTH DAKOTA TO 70 MILES SOUTH SOUTHWEST

OF FARGO NORTH DAKOTA.  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 605...WW 606...



DISCUSSION...BOW MCS MAY CONTINUE TO PRODUCE DMGG WIND EWD INTO ERN

ND DESPITE ENCOUNTERING SKIN LAYER OF COOL OUTFLOW FROM EARLIER

STORMS...GIVEN CURRENT SPEED OF MOVEMENT OF MCS...AND LIKELY

PRESENCE OF A LAYER OF STEEP LAPSE RATES/RETURNING MOISTURE

IMMEDIATELY ABOVE LOW LVL OUTFLOW.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 25035.





...CORFIDI

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