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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 515

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT SUN JUN 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST THROUGH NORTH CENTRAL NEBRASKA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 610 PM UNTIL

100 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF ONEILL

NEBRASKA TO 15 MILES SOUTH SOUTHEAST OF MCCOOK NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 511...WW 512...WW

513...WW 514...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH ALONG

LOW LVL CONFLUENCE ZONE FROM SW NEB NNE TO N CNTRL NEB.

INCREASINGLY MOIST SSELY LOW LVL FLOW E OF CONFLUENCE ZONE AND

PRESENCE OF 35-45 KT WSWLY TO SWLY DEEP SHEAR SUGGEST POTENTIAL FOR

SUPERCELLS WITH LARGE HAIL/HIGH WIND AND TORNADOES.  ACTIVITY SHOULD

EVOLVE INTO A COMPLEX MCS OR TWO BY MID TO LATE EVE...WITH EMBEDDED

SUPERCELLS CONTINUING TO POSE A RISK FOR SVR WEATHER AS UPR

DIFFLUENCE/LLJ CONTINUE TO INCREASE OVER REGION DOWNSTREAM FROM

STRONG UPR TROUGH NOW OVER UT.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 23025.





...CORFIDI

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