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WWUS20 KWNS 292138

SEL8

SPC WW 292138

IAZ000-KSZ000-MOZ000-NEZ000-300500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 108

NWS STORM PREDICTION CENTER NORMAN OK

440 PM CDT THU APR 29 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHWEST IOWA

       NORTH CENTRAL AND NORTHEAST KANSAS

       EXTREME NORTHWEST MISSOURI

       SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON FROM 440 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2.5 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 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES EAST OF OMAHA

NEBRASKA TO 5 MILES NORTH OF RUSSELL KANSAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU8).



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.



DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG THE SLOWLY

RETREATING DRYLINE...ON THE NOSE OF THE HOT SURFACE TEMPERATURES AND

DEEP MIXED LAYER EXTENDING NEWD INTO CENTRAL KS.  INITIALLY...THE

ENVIRONMENT WILL FAVOR SUPERCELLS WITH THE THREAT FOR LARGE HAIL.

LATER THIS EVENING AS THE LOW-LEVEL JET STRENGTHENS AND LOW-LEVEL

MOISTURE INCREASES GRADUALLY...THERE WILL BE SOME THREAT FOR A

COUPLE OF TORNADOES WITH STORMS MOVING NEWD ALONG THE

MOISTURE/INSTABILITY GRADIENT.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 23040.





...THOMPSON

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