

453 

WWUS20 KWNS 200251

SEL8

SPC WW 200251

IAZ000-NEZ000-200900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 518

NWS STORM PREDICTION CENTER NORMAN OK

945 PM CDT SUN JUN 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN IOWA

       CENTRAL AND EASTERN NEBRASKA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 945 PM UNTIL

400 AM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 110 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF TEKAMAH

NEBRASKA TO 50 MILES WEST SOUTHWEST OF BEATRICE NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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 513...WW 515...WW

516...WW 517...



DISCUSSION...DISCRETE SUPERCELLS IN CNTRL NEB EXPECTED TO CONTINUE

MOVING/DEVELOPING GENERALLY ENEWD...WITH OTHER STORMS EXPECTED TO

CONTINUE FORMING ALONG W-E WARM FRONT IN SE NEB/SW IA.  VERY STRONG

INSTABILITY /PER 00Z TOP SOUNDING/...BACKED NEAR-SFC  WINDS

RESULTING FROM DEEPENING OPF W KS LEE CYCLONE...40+ KT 1 KM SLY

FLOW...AND VERY RICH MOISTURE /850 MB DEWPOINT 20C AT TOP/ SUGGEST

GOOD CHANCE FOR LARGE HAIL AND TORNADOES...IN ADDITION TO DMGG WIND

AS CONVECTION ULTIMATELY EVOLVES INTO ONE OR TWO COMPLEX MCSS.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

600. MEAN STORM MOTION VECTOR 23030.





...CORFIDI

