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124 

WWUS20 KWNS 172315

SEL5

SPC WW 172315

NEZ000-180400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 485

NWS STORM PREDICTION CENTER NORMAN OK

615 PM CDT SAT JUL 17 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWESTERN NEBRASKA



EFFECTIVE THIS SATURDAY EVENING FROM 615 PM UNTIL 1100 PM CDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

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

NORTHEAST OF BURWELL NEBRASKA TO 15 MILES SOUTHWEST OF MCCOOK

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 483...WW 484...



DISCUSSION...STORMS ARE EXPECTED TO DEVELOP THROUGH THE EVENING

ALONG A COLD FRONT MOVING SLOWLY EWD ACROSS CENTRAL/SWRN NEB. HIGH

BASED STORMS IN SWRN NEB ARE MOSTLY LIKELY TO PRODUCE WIND DAMAGE

GIVEN THE LARGE TEMPERATURE/DEWPOINTS SPREADS. AS THE FRONT AND

STORMS DEVELOP AND SPREAD INTO A MUCH MORE MOIST AND UNSTABLE AIR

MASS ACROSS CENTRAL NEB...SUPERCELLS ARE POSSIBLE ALONG WITH LARGE

HAIL AND WIND DAMAGE.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 29020.





...IMY

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