

810 

WWUS20 KWNS 012307

SEL9

SPC WW 012307

NEZ000-020600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 459

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT THU AUG 1 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH CENTRAL AND SOUTHEAST NEBRASKA



* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 610 PM

  UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH OF

OMAHA NEBRASKA TO 25 MILES WEST NORTHWEST OF HASTINGS NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 454...WW 455...WW

456...WW 457...WW 458...



DISCUSSION...THUNDERSTORM CLUSTER WITH EMBEDDED SUPERCELLS WILL

CONTINUE TO MOVE SWD/SEWD THROUGH EARLY TONIGHT...POTENTIALLY

REACHING THE KS/NEB BORDER REGION LATER TONIGHT.  DOWNSTREAM

INSTABILITY AND DEEP-LAYER SHEAR ARE BOTH SUFFICIENT FOR ORGANIZED

SEVERE STORMS...WITH AN ATTENDANT RISK FOR DAMAGING WINDS AND 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 550. MEAN STORM

MOTION VECTOR 34025.





...THOMPSON

