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000 

WWUS20 KWNS 070040

SEL5

SPC WW 070040

NEZ000-SDZ000-070800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 355

NWS STORM PREDICTION CENTER NORMAN OK

740 PM CDT WED JUN 6 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL NEBRASKA

       EASTERN AND SOUTHERN SOUTH DAKOTA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 740 PM

UNTIL 300 AM CDT.



TORNADOES...HAIL TO 2.5 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES EAST NORTHEAST OF

HURON SOUTH DAKOTA TO 35 MILES WEST OF KEARNEY 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 353...WW 354...



DISCUSSION...TSTMS EXPECTED TO FORM LATER THIS EVENING INVOF MCS

OUTFLOW BOUNDARY/DRY LINE INTERSECTION OVER NRN AND CNTRL NEB.

OTHER STORMS SHOULD CONTINUE TO FORM ALONG MCS OUTFLOW IN SD.

STRENGTHENING WIND FIELD ASSOCIATED WITH CONTINUED ENE MOTION OF

POTENT CO SHORT WAVE TROUGH...DIURNAL DECOUPLING OF THE BOUNDARY

LAYER...AND INCREASING LOW LEVEL MOISTURE RETURN SUGGEST POTENTIAL

FOR A FEW SUSTAINED SUPERCELLS WITH LARGE HAIL/HIGH WIND AND

POSSIBLE TORNADOES INTO EARLY THURSDAY.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 23035.





...CORFIDI

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