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933 

WWUS20 KWNS 230314

SEL5

SPC WW 230314

MNZ000-NDZ000-231000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 675

NWS STORM PREDICTION CENTER NORMAN OK

1010 PM CDT FRI JUL 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST MINNESOTA

       CENTRAL AND EASTERN NORTH DAKOTA



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1010 PM

UNTIL 500 AM 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 130

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH

NORTHWEST OF GRAND FORKS NORTH DAKOTA TO 55 MILES SOUTHWEST OF

FARGO NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 673...WW 674...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE AND POSSIBLY

STRENGTH ALONG 850 MB WARM/QSTNRY FRONT LYING WSW/ESE ALONG MAIN

AXIS OF WW THROUGH EARLY SAT.  DEGREE OF ELEVATED INSTABILITY

/MAINLY GIVEN 16-17C 850 MB DEW POINTS/ AND STRENGTHENING OF SLY LLJ

SUGGEST POTENTIAL FOR SVR HAIL.  OTHERWISE...WRN/CNTRL ND BOW MCS

SHOULD CONTINUE MAINLY EWD.  WHILE CONVECTIVE SYSTEM LIKELY WILL

BECOME SOMEWHAT ELEVATED IN WW AREA...POTENTIAL WILL STILL EXIST FOR

DMGG SFC GUSTS GIVEN HEAVY PRECIP LOADING...ELY LOW LVL FLOW...AND

DEGREE OF ORGANIZATION OF LINE.



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 500. MEAN STORM

MOTION VECTOR 26030.





...CORFIDI

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