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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 562

NWS STORM PREDICTION CENTER NORMAN OK

340 PM CDT TUE AUG 3 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL NEBRASKA

       SOUTH CENTRAL SOUTH DAKOTA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 340 PM UNTIL

900 PM 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES SOUTHWEST

OF PHILIP SOUTH DAKOTA TO 50 MILES NORTH NORTHEAST OF AINSWORTH

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 561...



DISCUSSION...MCS OVER SW SD WILL LIKELY PERSIST THROUGH THE

AFTERNOON/EVENING WHILE PROGRESSING EWD/ESEWD ALONG A WEAK SURFACE

BOUNDARY NEAR THE SD/NEB BORDER.  A CORRIDOR OF MODERATE-STRONG

INSTABILITY ALONG THIS BOUNDARY WILL HELP MAINTAIN STORM

INTENSITY...AND DEEP-LAYER SPEED SHEAR WILL REMAIN SUFFICIENT FOR AN

ORGANIZED STORM CLUSTER WITH DAMAGING WINDS AND ISOLATED LARGE HAIL.



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 29025.





...THOMPSON

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