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WWUS20 KWNS 190110

SEL3

SPC WW 190110

NEZ000-190800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 493

NWS STORM PREDICTION CENTER NORMAN OK

810 PM CDT SUN JUL 18 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL NEBRASKA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 810 PM UNTIL

300 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST

NORTHWEST OF SCOTTSBLUFF NEBRASKA TO 30 MILES SOUTHEAST OF

BURWELL 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 492...



DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE

ACROSS WRN NEB DURING THE NEXT FEW HOURS AS LOW LEVEL JET INCREASES

NORTH OF A SURFACE BOUNDARY LOCATED IN NRN KS. THE STORMS ARE

EXPECTED TO SPREAD ESEWD LATER TONIGHT INTO CENTRAL NEB. DEEP LAYER

SHEAR NEAR 50 KT COMBINED WITH STEEP LAPSE RATES AND MODERATE

INSTABILITY WILL BE FAVORABLE FOR SUPERCELLS WITH LARGE HAIL. IF THE

STORMS MERGE INTO A LINE SEGMENT LATER TONIGHT...THERE WOULD BE A

GREATER POTENTIAL FOR DAMAGING WINDS.



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

