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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 618

NWS STORM PREDICTION CENTER NORMAN OK

615 PM CDT SUN JUL 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN MINNESOTA

       EAST-CENTRAL SOUTH DAKOTA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 615 PM UNTIL

200 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 80

STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES NORTHEAST OF

MANKATO MINNESOTA TO 25 MILES NORTH OF ORTONVILLE MINNESOTA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 616...WW 617...



DISCUSSION...A BOWING MCS HAS EVOLVED THIS EVENING ACROSS FAR SERN

ND/NERN SD IN ADVANCE OF MIDLEVEL IMPULSE TRANSLATING ENEWD ACROSS

THE REGION.  INFLOW AIR MASS REMAINS HOT AND QUITE MOIST WITH MLCAPE

VALUES OF 2000-3000 J/KG...WHICH SHOULD CONTINUE TO SUSTAIN VIGOROUS

UPDRAFT GROWTH ALONG THE LEADING EDGE OF ORGANIZING SYSTEM COLD

POOL.  WHILE A BRIEF TORNADO IS POSSIBLE...DAMAGING WINDS AND SOME

LARGE HAIL APPEAR TO BE THE PRIMARY HAZARDS AS BOW ECHO CONTINUES

SEWD ACROSS THE WATCH AREA.



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 500. MEAN STORM

MOTION VECTOR 29040.





...MEAD

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