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WWUS20 KWNS 142159

SEL9

SPC WW 142159

IAZ000-KSZ000-MOZ000-150500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 169

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT SAT APR 14 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN IOWA

       FAR NORTHEAST KANSAS

       NORTHERN MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF SHENANDOAH

IOWA TO 25 MILES SOUTH SOUTHEAST OF OTTUMWA IOWA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 165...WW 166...WW

167...WW 168...



DISCUSSION...EVOLVING BOW ECHO/HP SUPERCELL OVER SERN NEB IS

EXPECTED TO CONTINUE ENEWD ALONG WARM FRONT...POTENTIALLY ENHANCING

DOWNSTREAM STORM DEVELOPMENT ALONG WARM FRONT.  LATEST MODEL

GUIDANCE INDICATES THAT A SSWLY LLJ WILL STRENGTHEN TO 50+ KT ACROSS

REGION TONIGHT...ENHANCING CONVERGENCE ALONG WARM FRONT...AND

LOW-LEVEL SHEAR.  AS SUCH...A RISK FOR TORNADOES...DAMAGING WINDS

AND LARGE HAIL WILL EXIST WITH ANY SUSTAINED STORM STRUCTURES.



AVIATION...TORNADOES AND 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 24035.





...MEAD

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