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518 

WWUS20 KWNS 200428

SEL9

SPC WW 200428

KSZ000-NEZ000-201000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 499

NWS STORM PREDICTION CENTER NORMAN OK

1125 PM CDT MON JUL 19 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL KANSAS

       SOUTH CENTRAL NEBRASKA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1125 PM

UNTIL 500 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 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF

KEARNEY NEBRASKA TO 55 MILES EAST OF HASTINGS NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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 498...



DISCUSSION...FRONTAL BOUNDARY IS LOCATED IN FAR NRN KS AND SLY LOW

LEVEL JET SHOULD INCREASE LIFT NORTH OF THE FRONT THROUGH THE NIGHT.

STORMS ARE APPROACHING THE AREA FROM THE WEST AND OTHER NEW STORMS

ARE EXPECTED TO DEVELOP DURING THE NEXT COUPLE OF HOURS. STRONG DEEP

LAYER SHEAR AND STRONG INSTABILITY ARE FAVORABLE FOR SEVERE STORMS.

IF THE STORMS CAN ORGANIZE INTO A LINE SEGMENT...THE THREAT FOR WIND

DAMAGE WOULD INCREASE.



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 29025.





...IMY

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