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539 

WWUS20 KWNS 092249

SEL7

SPC WW 092249

IAZ000-KSZ000-MOZ000-NEZ000-100600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 87

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT TUE APR 9 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST IOWA

       NORTHEAST KANSAS

       NORTHWEST MISSOURI

       SOUTHEAST NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 545

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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST OF

SALINA KANSAS TO 35 MILES EAST NORTHEAST OF LINCOLN NEBRASKA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 86...



DISCUSSION...SIGNIFICANT ELEVATED BUOYANCY EXISTS ATOP SHALLOW

ARCTIC AIR MASS.  MUCAPE ON THE ORDER OF 1500 J/KG HAS ADVANCED

NORTH OF I-70 AND FAVORABLE TRAJECTORIES SUPPORT FURTHER

DESTABILIZATION INTO PORTIONS OF SERN NEB AND SWRN IA.  MULTIPLE

CLUSTERS OF STRONG ELEVATED THUNDERSTORMS ARE EXPECTED THIS EVENING

WITH THE GREATEST SEVERE RISK BEING LARGE HAIL.



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 21035.





...DARROW

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