

000 

WWUS20 KWNS 282253

SEL3

SPC WW 282253

NEZ000-290600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 693

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT FRI SEP 28 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWEST NEBRASKA



EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 555 PM

UNTIL 100 AM CDT.



HAIL TO 2 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 50

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

SOUTHEAST OF IMPERIAL NEBRASKA TO 10 MILES EAST NORTHEAST OF

MULLEN NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 692...



DISCUSSION...ENVIRONMENT WILL REMAIN SUPPORTIVE OF SUPERCELLS

THROUGH THE EVENING AS LOW-LEVEL MOISTURE SURGES NWD FROM WRN KS

INTO NEB...AND THE LLJ INCREASES THIS EVENING.  LARGE HAIL AND

DAMAGING GUSTS WILL BE THE PRIMARY THREATS...THOUGH AN

ISOLATED/BRIEF TORNADO CANNOT BE RULED OUT THIS EVENING BEFORE THE

BOUNDARY LAYER STABILIZES.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 25020.





...THOMPSON

